diff --git a/README.ja.md b/README.ja.md
index f7579b6..ca1df60 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -38,7 +38,7 @@ API プロバイダー統合、プロトコル変換、認証情報管理、ク
 - OpenAI、Claude、Gemini 互換の API エンドポイントをそのままコピー。
 - ローカル接続状態の確認。
 
-コアのインストール、バージョン比較、オフラインインストールは **バージョン管理** ページで行えます。GitHub 公式、GitCode、GitHub ミラープロキシを切り替えられ、更新に失敗した場合は自動的に別の利用可能なソースへ切り替わります。
+コアのインストール、バージョン比較、オフラインインストールは **バージョン管理** ページで行えます。GitHub 公式、GitCode、GitHub ミラープロキシを切り替えたり、カスタム HTTPS ミラープレフィックスを追加したりできます。更新に失敗した場合は自動的に別の利用可能なソースへ切り替わります。
 
 ### OAuth アカウント認証
 
diff --git a/README.md b/README.md
index be6628a..e2728e3 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,8 @@ The Home page provides a quick overview of the local proxy runtime and ready-to-
 
 Core installation, version comparison, and offline installation are available from the
 **Version Management** page. You can switch between official GitHub, GitCode, and GitHub
-mirror proxies; application and core updates prefer the selected channel and fall back automatically.
+mirror proxies or add custom HTTPS mirror prefixes; application and core updates prefer the selected
+channel and fall back automatically.
 
 ### OAuth account authorization
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index c10c6ae..91da69e 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -45,7 +45,7 @@ APIMart 是一个低成本的 AI 图像与视频生成 API 平台——GPT-Image
 - 复制可直接使用的 OpenAI、Claude 和 Gemini 兼容 API 地址。
 - 查看本地连接状态。
 
-内核安装、版本对比和离线安装功能位于 **版本管理** 页面；可在此切换 GitHub 官方源、GitCode 国内源或 GitHub 镜像代理，软件与内核更新会优先使用所选渠道，并在失败时自动回退。
+内核安装、版本对比和离线安装功能位于 **版本管理** 页面；可在此切换 GitHub 官方源、GitCode 国内源或 GitHub 镜像代理，也可以添加自定义 HTTPS 镜像前缀。软件与内核更新会优先使用所选渠道，并在失败时自动回退。
 
 ### OAuth 账号授权
 
diff --git a/src-tauri/src/app_update.rs b/src-tauri/src/app_update.rs
index 3298400..d2d4208 100644
--- a/src-tauri/src/app_update.rs
+++ b/src-tauri/src/app_update.rs
@@ -8,10 +8,15 @@ pub(crate) fn get_version_source_settings(
     gui_config_state: tauri::State<'_, GuiConfigState>,
 ) -> Result<VersionSourceSettings, String> {
     let config = gui_config_state.snapshot()?;
-    Ok(VersionSourceSettings {
-        source: config.download_source,
+    Ok(version_source_settings(&config))
+}
+
+fn version_source_settings(config: &GuiConfigFile) -> VersionSourceSettings {
+    VersionSourceSettings {
+        source: config.selected_download_candidate().key(),
         gitcode_available: gitcode_version_source_available(),
-    })
+        custom_mirrors: config.custom_download_mirrors.clone(),
+    }
 }
 
 #[tauri::command]
@@ -19,16 +24,60 @@ pub(crate) fn set_download_source(
     gui_config_state: tauri::State<'_, GuiConfigState>,
     source: String,
 ) -> Result<VersionSourceSettings, String> {
-    let source =
-        VersionDownloadSource::from_str(&source).ok_or_else(|| "不支持的下载源".to_string())?;
-    if source == VersionDownloadSource::Gitcode && !gitcode_version_source_available() {
+    let candidate = if let Some(url) = source.strip_prefix("custom:") {
+        VersionDownloadCandidate::custom(&normalize_custom_download_mirror_url(url)?)
+    } else {
+        VersionDownloadCandidate::builtin(
+            VersionDownloadSource::from_str(&source)
+                .filter(|source| *source != VersionDownloadSource::Custom)
+                .ok_or_else(|| "不支持的下载源".to_string())?,
+        )
+    };
+    if candidate.source == VersionDownloadSource::Gitcode && !gitcode_version_source_available() {
         return Err("当前构建未配置完整的 GitCode 软件与内核镜像源".to_string());
     }
-    let config = gui_config_state.set_download_source(source)?;
-    Ok(VersionSourceSettings {
-        source: config.download_source,
-        gitcode_available: gitcode_version_source_available(),
-    })
+    let config = gui_config_state.set_download_candidate(candidate)?;
+    Ok(version_source_settings(&config))
+}
+
+#[tauri::command]
+pub(crate) fn add_custom_download_mirror(
+    gui_config_state: tauri::State<'_, GuiConfigState>,
+    url: String,
+) -> Result<VersionSourceSettings, String> {
+    let url = normalize_custom_download_mirror_url(&url)?;
+    let config = gui_config_state.update(|config| {
+        if !config.custom_download_mirrors.contains(&url) {
+            if config.custom_download_mirrors.len() >= 12 {
+                return Err("最多可添加 12 个自定义镜像".to_string());
+            }
+            config.custom_download_mirrors.push(url.clone());
+        }
+        config.download_source = VersionDownloadSource::Custom;
+        config.active_custom_download_mirror = url.clone();
+        config.prefer_gitcode_downloads = false;
+        Ok(())
+    })?;
+    Ok(version_source_settings(&config))
+}
+
+#[tauri::command]
+pub(crate) fn remove_custom_download_mirror(
+    gui_config_state: tauri::State<'_, GuiConfigState>,
+    url: String,
+) -> Result<VersionSourceSettings, String> {
+    let url = normalize_custom_download_mirror_url(&url)?;
+    let config = gui_config_state.update(|config| {
+        config.custom_download_mirrors.retain(|item| item != &url);
+        if config.download_source == VersionDownloadSource::Custom
+            && config.active_custom_download_mirror == url
+        {
+            config.download_source = VersionDownloadSource::Github;
+            config.active_custom_download_mirror.clear();
+        }
+        Ok(())
+    })?;
+    Ok(version_source_settings(&config))
 }
 
 #[tauri::command]
@@ -45,10 +94,7 @@ pub(crate) fn set_prefer_gitcode_downloads(
         return Err("当前构建未配置完整的 GitCode 软件与内核镜像源".to_string());
     }
     let config = gui_config_state.set_download_source(source)?;
-    Ok(VersionSourceSettings {
-        source: config.download_source,
-        gitcode_available: gitcode_version_source_available(),
-    })
+    Ok(version_source_settings(&config))
 }
 
 pub(crate) fn gitcode_version_source_available() -> bool {
@@ -58,8 +104,8 @@ pub(crate) fn gitcode_version_source_available() -> bool {
 pub(crate) fn persist_automatic_download_source_switch(
     app: &tauri::AppHandle,
     gui_config_state: &GuiConfigState,
-    requested_source: VersionDownloadSource,
-    resolved_source: VersionDownloadSource,
+    requested_source: &VersionDownloadCandidate,
+    resolved_source: &VersionDownloadCandidate,
 ) -> Result<(), String> {
     let Some(config) =
         gui_config_state.switch_download_source_after_failure(requested_source, resolved_source)?
@@ -68,10 +114,7 @@ pub(crate) fn persist_automatic_download_source_switch(
     };
     app.emit(
         VERSION_DOWNLOAD_SOURCE_CHANGED_EVENT,
-        VersionSourceSettings {
-            source: config.download_source,
-            gitcode_available: gitcode_version_source_available(),
-        },
+        version_source_settings(&config),
     )
     .map_err(|error| format!("通知下载源自动切换失败: {error}"))
 }
@@ -88,23 +131,30 @@ pub(crate) async fn check_app_update(
     gui_config_state: tauri::State<'_, GuiConfigState>,
 ) -> Result<AppUpdateInfo, String> {
     let config = gui_config_state.snapshot()?;
-    let proxy_url = config.proxy_url;
+    let proxy_url = config.proxy_url.clone();
     let client = build_http_client_with_proxy(
         reqwest::Client::builder()
-            .redirect(release_https_redirect_policy())
+            .redirect(release_https_redirect_policy_with_mirrors(
+                &config.custom_download_mirrors,
+            ))
             .connect_timeout(Duration::from_secs(8))
             .read_timeout(Duration::from_secs(15))
             .timeout(Duration::from_secs(20)),
         &proxy_url,
         "创建版本检查客户端失败",
     )?;
-    let (manifest, resolved_source) =
-        fetch_portable_update_manifest(&client, config.download_source).await?;
+    let requested_source = config.selected_download_candidate();
+    let (manifest, resolved_source) = fetch_portable_update_manifest(
+        &client,
+        requested_source.clone(),
+        &config.custom_download_mirrors,
+    )
+    .await?;
     persist_automatic_download_source_switch(
         &app,
         gui_config_state.inner(),
-        config.download_source,
-        resolved_source,
+        &requested_source,
+        &resolved_source,
     )?;
     let latest_version = normalize_version(&manifest.version);
     let current_version = normalize_version(env!("CARGO_PKG_VERSION"));
@@ -161,12 +211,15 @@ pub(crate) async fn check_app_update(
 
 pub(crate) async fn fetch_portable_update_manifest(
     client: &reqwest::Client,
-    source: VersionDownloadSource,
-) -> Result<(PortableUpdateManifest, VersionDownloadSource), String> {
+    source: VersionDownloadCandidate,
+    custom_mirrors: &[String],
+) -> Result<(PortableUpdateManifest, VersionDownloadCandidate), String> {
     let gitcode_repository = configured_gitcode_gui_repository();
     let mut failures = Vec::new();
-    for candidate in version_download_source_candidates(source, gitcode_repository.is_some()) {
-        let result = match candidate {
+    for candidate in
+        version_download_source_candidates(source, gitcode_repository.is_some(), custom_mirrors)
+    {
+        let result = match candidate.source {
             VersionDownloadSource::Gitcode => {
                 fetch_portable_update_manifest_from_gitcode(
                     client,
@@ -177,7 +230,11 @@ pub(crate) async fn fetch_portable_update_manifest(
             VersionDownloadSource::Github
             | VersionDownloadSource::GhProxy
             | VersionDownloadSource::GhFast => {
-                let url = version_source_url(candidate, APP_UPDATE_MANIFEST_URL);
+                let url = version_source_url(&candidate, APP_UPDATE_MANIFEST_URL);
+                fetch_portable_update_manifest_url(client, &url).await
+            }
+            VersionDownloadSource::Custom => {
+                let url = version_source_url(&candidate, APP_UPDATE_MANIFEST_URL);
                 fetch_portable_update_manifest_url(client, &url).await
             }
         };
@@ -275,8 +332,15 @@ pub(crate) fn gitcode_release_attachment_url(
     )
 }
 
-pub(crate) fn release_https_redirect_policy() -> reqwest::redirect::Policy {
-    reqwest::redirect::Policy::custom(|attempt| {
+pub(crate) fn release_https_redirect_policy_with_mirrors(
+    custom_mirrors: &[String],
+) -> reqwest::redirect::Policy {
+    let custom_hosts = custom_mirrors
+        .iter()
+        .filter_map(|value| reqwest::Url::parse(value).ok())
+        .filter_map(|url| url.host_str().map(str::to_string))
+        .collect::<HashSet<_>>();
+    reqwest::redirect::Policy::custom(move |attempt| {
         let url = attempt.url();
         let trusted_host = matches!(
             url.host_str(),
@@ -290,7 +354,9 @@ pub(crate) fn release_https_redirect_policy() -> reqwest::redirect::Policy {
                     | "gh-proxy.com"
                     | "ghfast.top"
             )
-        );
+        ) || url
+            .host_str()
+            .is_some_and(|host| custom_hosts.contains(host));
         if url.scheme() == "https"
             && url.port().is_none()
             && url.username().is_empty()
@@ -566,8 +632,8 @@ pub(crate) async fn start_app_update(
         return Err("当前平台不支持应用内自动升级".to_string());
     }
     let config = gui_config_state.snapshot()?;
-    let proxy_url = config.proxy_url;
-    let download_source = config.download_source;
+    let proxy_url = config.proxy_url.clone();
+    let download_source = config.selected_download_candidate();
     let token = CancellationToken::new();
     let pending = state.start(token.clone())?;
     let task = state.snapshot();
@@ -604,7 +670,7 @@ pub(crate) async fn download_and_stage_portable_app_update(
     pending: &PendingAppUpdate,
     token: &CancellationToken,
     proxy_url: &str,
-    download_source: VersionDownloadSource,
+    download_source: VersionDownloadCandidate,
 ) -> Result<(), String> {
     #[cfg(not(any(windows, target_os = "linux", target_os = "macos")))]
     {
@@ -634,7 +700,7 @@ pub(crate) async fn download_and_stage_portable_app_update(
                 token,
                 &archive_path,
                 proxy_url,
-                download_source,
+                &download_source,
             )
             .await?;
             if token.is_cancelled() {
@@ -720,7 +786,7 @@ pub(crate) async fn download_and_stage_portable_app_update(
                 token,
                 &archive_path,
                 proxy_url,
-                download_source,
+                &download_source,
             )
             .await?;
             ensure_portable_update_download(token, &archive_path, pending)?;
@@ -792,7 +858,7 @@ pub(crate) async fn download_and_stage_portable_app_update(
                 token,
                 &archive_path,
                 proxy_url,
-                download_source,
+                &download_source,
             )
             .await?;
             ensure_portable_update_download(token, &archive_path, pending)?;
@@ -967,11 +1033,17 @@ pub(crate) async fn download_portable_update_archive(
     token: &CancellationToken,
     destination: &Path,
     proxy_url: &str,
-    download_source: VersionDownloadSource,
+    download_source: &VersionDownloadCandidate,
 ) -> Result<(), String> {
     let client = build_http_client_with_proxy(
         reqwest::Client::builder()
-            .redirect(release_https_redirect_policy())
+            .redirect(release_https_redirect_policy_with_mirrors(
+                &download_source
+                    .custom_url
+                    .clone()
+                    .into_iter()
+                    .collect::<Vec<_>>(),
+            ))
             .connect_timeout(Duration::from_secs(15))
             .read_timeout(Duration::from_secs(30))
             .timeout(Duration::from_secs(15 * 60)),
@@ -1004,15 +1076,15 @@ pub(crate) async fn download_portable_update_archive(
 
 pub(crate) fn portable_update_download_urls(
     asset: &PortableUpdateAsset,
-    source: VersionDownloadSource,
+    source: &VersionDownloadCandidate,
 ) -> Vec<String> {
     let mut urls = std::iter::once(asset.url.as_str())
         .chain(asset.fallback_urls.iter().map(String::as_str))
         .map(str::to_string)
         .collect::<Vec<_>>();
-    if source == VersionDownloadSource::Gitcode {
+    if source.source == VersionDownloadSource::Gitcode {
         urls.sort_by_key(|url| update_download_source_name(url) != "GitCode");
-    } else if source.github_proxy_prefix().is_some() {
+    } else if source.proxy_prefix().is_some() {
         if let Some(github_url) = urls
             .iter()
             .find(|url| update_download_source_name(url) == "GitHub")
@@ -1025,15 +1097,21 @@ pub(crate) fn portable_update_download_urls(
     urls
 }
 
-pub(crate) fn update_download_source_name(url: &str) -> &'static str {
+pub(crate) fn update_download_source_name(url: &str) -> String {
     let host = reqwest::Url::parse(url)
         .ok()
         .and_then(|url| url.host_str().map(str::to_string));
     match host.as_deref() {
-        Some("gh-proxy.com") => "gh-proxy.com",
-        Some("ghfast.top") => "ghfast.top",
-        Some(host) if host == "api.gitcode.com" || host.ends_with(".gitcode.com") => "GitCode",
-        _ => "GitHub",
+        Some("gh-proxy.com") => "gh-proxy.com".to_string(),
+        Some("ghfast.top") => "ghfast.top".to_string(),
+        Some(host) if host == "api.gitcode.com" || host.ends_with(".gitcode.com") => {
+            "GitCode".to_string()
+        }
+        Some(
+            "github.com" | "objects.githubusercontent.com" | "release-assets.githubusercontent.com",
+        ) => "GitHub".to_string(),
+        Some(host) => host.to_string(),
+        None => "GitHub".to_string(),
     }
 }
 
diff --git a/src-tauri/src/core_config/settings.rs b/src-tauri/src/core_config/settings.rs
index fd512d2..3ace3d2 100644
--- a/src-tauri/src/core_config/settings.rs
+++ b/src-tauri/src/core_config/settings.rs
@@ -1245,6 +1245,11 @@ pub(crate) fn load_or_create_gui_config() -> Result<GuiConfigFile, String> {
         };
         changed = true;
     }
+    if presence.custom_download_mirrors.is_none()
+        || presence.active_custom_download_mirror.is_none()
+    {
+        changed = true;
+    }
     if presence.prefer_gitcode_downloads.is_none() {
         changed = true;
     }
@@ -1538,6 +1543,42 @@ pub(crate) fn sanitize_gui_config(config: &mut GuiConfigFile) -> Result<bool, St
         config.proxy_url = proxy_url;
         changed = true;
     }
+    let original_custom_mirrors = config.custom_download_mirrors.clone();
+    config.custom_download_mirrors = config
+        .custom_download_mirrors
+        .iter()
+        .filter_map(|url| normalize_custom_download_mirror_url(url).ok())
+        .fold(Vec::new(), |mut mirrors, url| {
+            if !mirrors.contains(&url) {
+                mirrors.push(url);
+            }
+            mirrors
+        });
+    if config.custom_download_mirrors != original_custom_mirrors {
+        changed = true;
+    }
+    if !config.active_custom_download_mirror.is_empty() {
+        match normalize_custom_download_mirror_url(&config.active_custom_download_mirror) {
+            Ok(normalized) if normalized != config.active_custom_download_mirror => {
+                config.active_custom_download_mirror = normalized;
+                changed = true;
+            }
+            Err(_) => {
+                config.active_custom_download_mirror.clear();
+                changed = true;
+            }
+            _ => {}
+        }
+    }
+    if config.download_source == VersionDownloadSource::Custom
+        && !config
+            .custom_download_mirrors
+            .contains(&config.active_custom_download_mirror)
+    {
+        config.download_source = VersionDownloadSource::Github;
+        config.active_custom_download_mirror.clear();
+        changed = true;
+    }
     let routing_session_affinity_ttl = config.routing_session_affinity_ttl.trim().to_string();
     if config.routing_session_affinity_ttl != routing_session_affinity_ttl {
         config.routing_session_affinity_ttl = routing_session_affinity_ttl;
@@ -1656,6 +1697,20 @@ pub(crate) fn write_gui_config_to_path(
         api_keys.push(Value::InlineTable(table));
     }
     set_codex_table_item(root, "api-keys", Item::Value(Value::Array(api_keys)));
+    let mut custom_download_mirrors = Array::new();
+    for url in &config.custom_download_mirrors {
+        custom_download_mirrors.push(url.as_str());
+    }
+    set_codex_table_item(
+        root,
+        "custom-download-mirrors",
+        Item::Value(Value::Array(custom_download_mirrors)),
+    );
+    set_codex_table_item(
+        root,
+        "active-custom-download-mirror",
+        value(config.active_custom_download_mirror.as_str()),
+    );
     let mut api_access_remarks = Array::new();
     for entry in &config.api_access_remarks {
         let mut table = InlineTable::new();
@@ -1720,6 +1775,18 @@ pub(crate) fn validate_gui_config(config: &GuiConfigFile) -> Result<(), String>
     if config.proxy_url.chars().any(char::is_control) {
         return Err("代理 URL 不能包含控制字符".to_string());
     }
+    for url in &config.custom_download_mirrors {
+        if normalize_custom_download_mirror_url(url).as_deref() != Ok(url.as_str()) {
+            return Err(format!("自定义下载镜像地址无效: {url}"));
+        }
+    }
+    if config.download_source == VersionDownloadSource::Custom
+        && !config
+            .custom_download_mirrors
+            .contains(&config.active_custom_download_mirror)
+    {
+        return Err("当前选择的自定义下载镜像不存在".to_string());
+    }
     if config
         .routing_session_affinity_ttl
         .chars()
diff --git a/src-tauri/src/core_runtime.rs b/src-tauri/src/core_runtime.rs
index 93f6e3c..3e8b646 100644
--- a/src-tauri/src/core_runtime.rs
+++ b/src-tauri/src/core_runtime.rs
@@ -7,14 +7,21 @@ pub(crate) async fn check_latest_core(
 ) -> Result<CoreLatest, String> {
     let platform = current_core_platform()?;
     let config = gui_config_state.snapshot()?;
-    let proxy_url = config.proxy_url;
-    let client = http_client(&proxy_url)?;
-    let (release, resolved_source) = fetch_release(&client, None, config.download_source).await?;
+    let proxy_url = config.proxy_url.clone();
+    let client = http_client(&proxy_url, &config.custom_download_mirrors)?;
+    let requested_source = config.selected_download_candidate();
+    let (release, resolved_source) = fetch_release(
+        &client,
+        None,
+        requested_source.clone(),
+        &config.custom_download_mirrors,
+    )
+    .await?;
     persist_automatic_download_source_switch(
         &app,
         gui_config_state.inner(),
-        config.download_source,
-        resolved_source,
+        &requested_source,
+        &resolved_source,
     )?;
     let asset = select_release_asset(&release, &platform)?;
 
@@ -114,7 +121,8 @@ pub(crate) async fn install_core_version(
                     token,
                     version,
                     &proxy_url,
-                    config.download_source,
+                    config.selected_download_candidate(),
+                    config.custom_download_mirrors.clone(),
                 )
                 .await,
             ),
@@ -276,13 +284,20 @@ pub(crate) async fn install_core_version_inner(
     token: CancellationToken,
     version: Option<String>,
     proxy_url: &str,
-    download_source: VersionDownloadSource,
+    download_source: VersionDownloadCandidate,
+    custom_mirrors: Vec<String>,
 ) -> Result<CoreInstallResult, String> {
     let platform = current_core_platform()?;
-    let client = http_client(proxy_url)?;
+    let client = http_client(proxy_url, &custom_mirrors)?;
     state.progress(window, "检查版本", 0, None, true);
-    let (release, _) =
-        fetch_release_cancelable(&client, version.as_deref(), &token, download_source).await?;
+    let (release, _) = fetch_release_cancelable(
+        &client,
+        version.as_deref(),
+        &token,
+        download_source,
+        &custom_mirrors,
+    )
+    .await?;
     let asset = select_release_asset(&release, &platform)?;
 
     let install_dir = core_install_dir()?;
@@ -413,22 +428,25 @@ pub(crate) fn install_bundled_core_inner(
 pub(crate) async fn fetch_release(
     client: &reqwest::Client,
     version: Option<&str>,
-    source: VersionDownloadSource,
-) -> Result<(GithubRelease, VersionDownloadSource), String> {
+    source: VersionDownloadCandidate,
+    custom_mirrors: &[String],
+) -> Result<(GithubRelease, VersionDownloadCandidate), String> {
     if let Some(version) = version {
         return Ok((
             release_from_tag_for_repositories(
                 version,
                 configured_gitcode_core_repository(),
-                source,
+                &source,
             ),
             source,
         ));
     }
     let gitcode_repository = configured_gitcode_core_repository();
     let mut failures = Vec::new();
-    for candidate in version_download_source_candidates(source, gitcode_repository.is_some()) {
-        let result = match candidate {
+    for candidate in
+        version_download_source_candidates(source, gitcode_repository.is_some(), custom_mirrors)
+    {
+        let result = match candidate.source {
             VersionDownloadSource::Gitcode => {
                 fetch_release_from_gitcode(
                     client,
@@ -438,7 +456,8 @@ pub(crate) async fn fetch_release(
             }
             VersionDownloadSource::Github
             | VersionDownloadSource::GhProxy
-            | VersionDownloadSource::GhFast => fetch_release_from_github(client, candidate).await,
+            | VersionDownloadSource::GhFast
+            | VersionDownloadSource::Custom => fetch_release_from_github(client, &candidate).await,
         };
         match result {
             Ok(release) => return Ok((release, candidate)),
@@ -450,7 +469,7 @@ pub(crate) async fn fetch_release(
 
 pub(crate) async fn fetch_release_from_github(
     client: &reqwest::Client,
-    source: VersionDownloadSource,
+    source: &VersionDownloadCandidate,
 ) -> Result<GithubRelease, String> {
     let atom_result = fetch_release_from_atom(client, source).await;
     match atom_result {
@@ -486,7 +505,7 @@ pub(crate) async fn fetch_release_from_gitcode(
 
 pub(crate) async fn fetch_release_from_page(
     client: &reqwest::Client,
-    source: VersionDownloadSource,
+    source: &VersionDownloadCandidate,
 ) -> Result<GithubRelease, String> {
     let release_page_url = version_source_url(source, RELEASE_PAGE_URL);
     let response = client
@@ -517,7 +536,7 @@ pub(crate) async fn fetch_release_from_page(
 
 pub(crate) async fn fetch_release_from_atom(
     client: &reqwest::Client,
-    source: VersionDownloadSource,
+    source: &VersionDownloadCandidate,
 ) -> Result<GithubRelease, String> {
     let release_atom_url = version_source_url(source, RELEASE_ATOM_URL);
     let response = client
@@ -568,22 +587,27 @@ pub(crate) fn release_tag_from_atom(xml: &str) -> Option<String> {
     (!title.is_empty()).then(|| normalize_version(title))
 }
 
+#[cfg(test)]
 pub(crate) fn release_from_tag(tag: &str) -> GithubRelease {
     release_from_tag_for_repositories(
         tag,
         configured_gitcode_core_repository(),
-        VersionDownloadSource::Github,
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::Github),
     )
 }
 
 pub(crate) fn release_from_gitcode_tag(tag: &str, repository: &str) -> GithubRelease {
-    release_from_tag_for_repositories(tag, Some(repository), VersionDownloadSource::Gitcode)
+    release_from_tag_for_repositories(
+        tag,
+        Some(repository),
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::Gitcode),
+    )
 }
 
 pub(crate) fn release_from_tag_for_repositories(
     tag: &str,
     gitcode_repository: Option<&str>,
-    source: VersionDownloadSource,
+    source: &VersionDownloadCandidate,
 ) -> GithubRelease {
     let tag = normalize_version(tag);
     let version = tag.trim_start_matches('v');
@@ -601,7 +625,7 @@ pub(crate) fn release_from_tag_for_repositories(
         let github_url = format!("{RELEASE_DOWNLOAD_PREFIX}{tag}/{name}");
         let gitcode_url = gitcode_repository
             .map(|repository| gitcode_release_attachment_url(repository, &tag, &name));
-        let (browser_download_url, fallback_download_urls) = match source {
+        let (browser_download_url, fallback_download_urls) = match source.source {
             VersionDownloadSource::Gitcode => match gitcode_url {
                 Some(gitcode_url) => (gitcode_url, vec![github_url]),
                 None => (github_url, Vec::new()),
@@ -613,6 +637,12 @@ pub(crate) fn release_from_tag_for_repositories(
                 (mirror_url, fallbacks)
             }
             VersionDownloadSource::Github => (github_url, gitcode_url.into_iter().collect()),
+            VersionDownloadSource::Custom => {
+                let mirror_url = version_source_url(source, &github_url);
+                let mut fallbacks = vec![github_url];
+                fallbacks.extend(gitcode_url);
+                (mirror_url, fallbacks)
+            }
         };
         GithubAsset {
             browser_download_url,
@@ -720,10 +750,11 @@ pub(crate) async fn fetch_release_cancelable(
     client: &reqwest::Client,
     version: Option<&str>,
     token: &CancellationToken,
-    source: VersionDownloadSource,
-) -> Result<(GithubRelease, VersionDownloadSource), String> {
+    source: VersionDownloadCandidate,
+    custom_mirrors: &[String],
+) -> Result<(GithubRelease, VersionDownloadCandidate), String> {
     tokio::select! {
-        result = fetch_release(client, version, source) => result,
+        result = fetch_release(client, version, source, custom_mirrors) => result,
         _ = token.cancelled() => Err("已取消下载".to_string()),
     }
 }
@@ -752,10 +783,13 @@ pub(crate) fn build_http_client_with_proxy(
         .map_err(|error| format!("{error_prefix}: {error}"))
 }
 
-pub(crate) fn http_client(proxy_url: &str) -> Result<reqwest::Client, String> {
+pub(crate) fn http_client(
+    proxy_url: &str,
+    custom_mirrors: &[String],
+) -> Result<reqwest::Client, String> {
     build_http_client_with_proxy(
         reqwest::Client::builder()
-            .redirect(release_https_redirect_policy())
+            .redirect(release_https_redirect_policy_with_mirrors(custom_mirrors))
             .connect_timeout(Duration::from_secs(15))
             .read_timeout(Duration::from_secs(30))
             .timeout(Duration::from_secs(600)),
@@ -846,15 +880,21 @@ pub(crate) async fn download_asset(
     Err(format!("所有内核下载源均失败: {}", failures.join("；")))
 }
 
-pub(crate) fn core_download_source_name(url: &str) -> &'static str {
+pub(crate) fn core_download_source_name(url: &str) -> String {
     let host = reqwest::Url::parse(url)
         .ok()
         .and_then(|url| url.host_str().map(str::to_string));
     match host.as_deref() {
-        Some("gh-proxy.com") => "gh-proxy.com",
-        Some("ghfast.top") => "ghfast.top",
-        Some(host) if host == "api.gitcode.com" || host.ends_with(".gitcode.com") => "GitCode",
-        _ => "GitHub",
+        Some("gh-proxy.com") => "gh-proxy.com".to_string(),
+        Some("ghfast.top") => "ghfast.top".to_string(),
+        Some(host) if host == "api.gitcode.com" || host.ends_with(".gitcode.com") => {
+            "GitCode".to_string()
+        }
+        Some(
+            "github.com" | "objects.githubusercontent.com" | "release-assets.githubusercontent.com",
+        ) => "GitHub".to_string(),
+        Some(host) => host.to_string(),
+        None => "GitHub".to_string(),
     }
 }
 
diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index c7f180e..14e79a5 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -593,6 +593,8 @@ struct GuiConfigFile {
     routing_strategy: String,
     proxy_url: String,
     download_source: VersionDownloadSource,
+    custom_download_mirrors: Vec<String>,
+    active_custom_download_mirror: String,
     // Kept for migration compatibility with configurations written before
     // multi-source downloads were introduced.
     prefer_gitcode_downloads: bool,
@@ -612,6 +614,7 @@ enum VersionDownloadSource {
     Gitcode,
     GhProxy,
     GhFast,
+    Custom,
 }
 
 impl VersionDownloadSource {
@@ -621,6 +624,7 @@ impl VersionDownloadSource {
             Self::Gitcode => "gitcode",
             Self::GhProxy => "gh-proxy",
             Self::GhFast => "gh-fast",
+            Self::Custom => "custom",
         }
     }
 
@@ -630,6 +634,7 @@ impl VersionDownloadSource {
             "gitcode" => Some(Self::Gitcode),
             "gh-proxy" => Some(Self::GhProxy),
             "gh-fast" => Some(Self::GhFast),
+            "custom" => Some(Self::Custom),
             _ => None,
         }
     }
@@ -640,6 +645,7 @@ impl VersionDownloadSource {
             Self::Gitcode => "GitCode",
             Self::GhProxy => "gh-proxy.com",
             Self::GhFast => "ghfast.top",
+            Self::Custom => "自定义镜像",
         }
     }
 
@@ -647,37 +653,124 @@ impl VersionDownloadSource {
         match self {
             Self::GhProxy => Some("https://gh-proxy.com/"),
             Self::GhFast => Some("https://ghfast.top/"),
+            Self::Custom => None,
             _ => None,
         }
     }
 }
 
-fn version_source_url(source: VersionDownloadSource, github_url: &str) -> String {
+#[derive(Clone, Debug, Eq, PartialEq)]
+struct VersionDownloadCandidate {
+    source: VersionDownloadSource,
+    custom_url: Option<String>,
+}
+
+impl VersionDownloadCandidate {
+    fn builtin(source: VersionDownloadSource) -> Self {
+        Self {
+            source,
+            custom_url: None,
+        }
+    }
+
+    fn custom(url: &str) -> Self {
+        Self {
+            source: VersionDownloadSource::Custom,
+            custom_url: Some(url.to_string()),
+        }
+    }
+
+    fn key(&self) -> String {
+        self.custom_url
+            .as_ref()
+            .map(|url| format!("custom:{url}"))
+            .unwrap_or_else(|| self.source.as_str().to_string())
+    }
+
+    fn display_name(&self) -> String {
+        self.custom_url
+            .as_ref()
+            .and_then(|url| reqwest::Url::parse(url).ok())
+            .and_then(|url| url.host_str().map(str::to_string))
+            .unwrap_or_else(|| self.source.display_name().to_string())
+    }
+
+    fn proxy_prefix(&self) -> Option<&str> {
+        self.custom_url
+            .as_deref()
+            .or_else(|| self.source.github_proxy_prefix())
+    }
+}
+
+fn version_source_url(source: &VersionDownloadCandidate, github_url: &str) -> String {
     source
-        .github_proxy_prefix()
+        .proxy_prefix()
         .map(|prefix| format!("{prefix}{github_url}"))
         .unwrap_or_else(|| github_url.to_string())
 }
 
 fn version_download_source_candidates(
-    preferred: VersionDownloadSource,
+    preferred: VersionDownloadCandidate,
     gitcode_available: bool,
-) -> Vec<VersionDownloadSource> {
-    [
+    custom_mirrors: &[String],
+) -> Vec<VersionDownloadCandidate> {
+    let mut candidates = vec![
         preferred,
-        VersionDownloadSource::Github,
-        VersionDownloadSource::Gitcode,
-        VersionDownloadSource::GhProxy,
-        VersionDownloadSource::GhFast,
-    ]
-    .into_iter()
-    .filter(|source| gitcode_available || *source != VersionDownloadSource::Gitcode)
-    .fold(Vec::new(), |mut sources, source| {
-        if !sources.contains(&source) {
-            sources.push(source);
+        VersionDownloadCandidate::builtin(VersionDownloadSource::Github),
+        VersionDownloadCandidate::builtin(VersionDownloadSource::Gitcode),
+        VersionDownloadCandidate::builtin(VersionDownloadSource::GhProxy),
+        VersionDownloadCandidate::builtin(VersionDownloadSource::GhFast),
+    ];
+    candidates.retain(|candidate| {
+        gitcode_available || candidate.source != VersionDownloadSource::Gitcode
+    });
+    candidates.extend(
+        custom_mirrors
+            .iter()
+            .map(|url| VersionDownloadCandidate::custom(url)),
+    );
+    candidates
+        .into_iter()
+        .fold(Vec::new(), |mut sources, source| {
+            if !sources.contains(&source) {
+                sources.push(source);
+            }
+            sources
+        })
+}
+
+fn normalize_custom_download_mirror_url(value: &str) -> Result<String, String> {
+    let mut url =
+        reqwest::Url::parse(value.trim()).map_err(|error| format!("镜像地址无效: {error}"))?;
+    if url.scheme() != "https"
+        || url.host_str().is_none()
+        || url.port().is_some()
+        || !url.username().is_empty()
+        || url.password().is_some()
+        || url.query().is_some()
+        || url.fragment().is_some()
+    {
+        return Err("镜像地址必须是无认证、端口、查询参数和片段的 HTTPS 地址".to_string());
+    }
+    if !url.path().ends_with('/') {
+        let path = format!("{}/", url.path());
+        url.set_path(&path);
+    }
+    Ok(url.to_string())
+}
+
+impl GuiConfigFile {
+    fn selected_download_candidate(&self) -> VersionDownloadCandidate {
+        if self.download_source == VersionDownloadSource::Custom
+            && self
+                .custom_download_mirrors
+                .contains(&self.active_custom_download_mirror)
+        {
+            VersionDownloadCandidate::custom(&self.active_custom_download_mirror)
+        } else {
+            VersionDownloadCandidate::builtin(self.download_source)
         }
-        sources
-    })
+    }
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize)]
@@ -785,6 +878,8 @@ impl Default for GuiConfigFile {
             routing_strategy: "round-robin".to_string(),
             proxy_url: String::new(),
             download_source: VersionDownloadSource::Github,
+            custom_download_mirrors: Vec::new(),
+            active_custom_download_mirror: String::new(),
             prefer_gitcode_downloads: false,
             routing_session_affinity: false,
             routing_session_affinity_ttl: String::new(),
@@ -815,6 +910,8 @@ struct GuiConfigPresence {
     routing_strategy: Option<String>,
     proxy_url: Option<String>,
     download_source: Option<VersionDownloadSource>,
+    custom_download_mirrors: Option<Vec<String>>,
+    active_custom_download_mirror: Option<String>,
     prefer_gitcode_downloads: Option<bool>,
     routing_session_affinity: Option<bool>,
     routing_session_affinity_ttl: Option<String>,
@@ -837,8 +934,9 @@ struct GuiSettings {
 #[derive(Clone, Serialize)]
 #[serde(rename_all = "camelCase")]
 struct VersionSourceSettings {
-    source: VersionDownloadSource,
+    source: String,
     gitcode_available: bool,
+    custom_mirrors: Vec<String>,
 }
 
 #[derive(Clone, Serialize)]
@@ -1828,30 +1926,48 @@ impl GuiConfigState {
     fn set_download_source(
         &self,
         download_source: VersionDownloadSource,
+    ) -> Result<GuiConfigFile, String> {
+        self.set_download_candidate(VersionDownloadCandidate::builtin(download_source))
+    }
+
+    fn set_download_candidate(
+        &self,
+        candidate: VersionDownloadCandidate,
     ) -> Result<GuiConfigFile, String> {
         self.update(|config| {
-            config.download_source = download_source;
-            config.prefer_gitcode_downloads = download_source == VersionDownloadSource::Gitcode;
+            if let Some(url) = &candidate.custom_url {
+                if !config.custom_download_mirrors.contains(url) {
+                    return Err("自定义镜像不存在".to_string());
+                }
+                config.active_custom_download_mirror = url.clone();
+            }
+            config.download_source = candidate.source;
+            config.prefer_gitcode_downloads = candidate.source == VersionDownloadSource::Gitcode;
             Ok(())
         })
     }
 
     fn switch_download_source_after_failure(
         &self,
-        expected_source: VersionDownloadSource,
-        fallback_source: VersionDownloadSource,
+        expected_source: &VersionDownloadCandidate,
+        fallback_source: &VersionDownloadCandidate,
     ) -> Result<Option<GuiConfigFile>, String> {
         let mut current = self
             .inner
             .lock()
             .map_err(|_| "GUI 配置状态锁已损坏".to_string())?;
-        if current.download_source != expected_source || expected_source == fallback_source {
+        if current.selected_download_candidate() != *expected_source
+            || expected_source == fallback_source
+        {
             return Ok(None);
         }
 
         let mut config = current.clone();
-        config.download_source = fallback_source;
-        config.prefer_gitcode_downloads = fallback_source == VersionDownloadSource::Gitcode;
+        config.download_source = fallback_source.source;
+        if let Some(url) = &fallback_source.custom_url {
+            config.active_custom_download_mirror = url.clone();
+        }
+        config.prefer_gitcode_downloads = fallback_source.source == VersionDownloadSource::Gitcode;
         sanitize_gui_config(&mut config)?;
         write_gui_config(&config)?;
         *current = config.clone();
@@ -2314,6 +2430,8 @@ fn main() {
             open_external_url,
             get_version_source_settings,
             set_download_source,
+            add_custom_download_mirror,
+            remove_custom_download_mirror,
             set_prefer_gitcode_downloads,
             check_app_update,
             get_app_update_task,
diff --git a/src-tauri/src/tests/app_update.rs b/src-tauri/src/tests/app_update.rs
index 1202cc7..92b446c 100644
--- a/src-tauri/src/tests/app_update.rs
+++ b/src-tauri/src/tests/app_update.rs
@@ -212,15 +212,24 @@ fn portable_update_download_order_respects_gitcode_preference() {
         &filename,
     )];
 
-    let github_first = portable_update_download_urls(&asset, VersionDownloadSource::Github);
+    let github_first = portable_update_download_urls(
+        &asset,
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::Github),
+    );
     assert_eq!(update_download_source_name(&github_first[0]), "GitHub");
     assert_eq!(update_download_source_name(&github_first[1]), "GitCode");
 
-    let gitcode_first = portable_update_download_urls(&asset, VersionDownloadSource::Gitcode);
+    let gitcode_first = portable_update_download_urls(
+        &asset,
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::Gitcode),
+    );
     assert_eq!(update_download_source_name(&gitcode_first[0]), "GitCode");
     assert_eq!(update_download_source_name(&gitcode_first[1]), "GitHub");
 
-    let mirror_first = portable_update_download_urls(&asset, VersionDownloadSource::GhProxy);
+    let mirror_first = portable_update_download_urls(
+        &asset,
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::GhProxy),
+    );
     assert_eq!(
         update_download_source_name(&mirror_first[0]),
         "gh-proxy.com"
@@ -232,24 +241,74 @@ fn portable_update_download_order_respects_gitcode_preference() {
 #[test]
 fn version_detection_candidates_try_every_available_source_once() {
     assert_eq!(
-        version_download_source_candidates(VersionDownloadSource::GhFast, true),
+        version_download_source_candidates(
+            VersionDownloadCandidate::builtin(VersionDownloadSource::GhFast),
+            true,
+            &[],
+        ),
         [
-            VersionDownloadSource::GhFast,
-            VersionDownloadSource::Github,
-            VersionDownloadSource::Gitcode,
-            VersionDownloadSource::GhProxy,
+            VersionDownloadCandidate::builtin(VersionDownloadSource::GhFast),
+            VersionDownloadCandidate::builtin(VersionDownloadSource::Github),
+            VersionDownloadCandidate::builtin(VersionDownloadSource::Gitcode),
+            VersionDownloadCandidate::builtin(VersionDownloadSource::GhProxy),
         ]
     );
     assert_eq!(
-        version_download_source_candidates(VersionDownloadSource::Gitcode, false),
+        version_download_source_candidates(
+            VersionDownloadCandidate::builtin(VersionDownloadSource::Gitcode),
+            false,
+            &[],
+        ),
         [
-            VersionDownloadSource::Github,
-            VersionDownloadSource::GhProxy,
-            VersionDownloadSource::GhFast,
+            VersionDownloadCandidate::builtin(VersionDownloadSource::Github),
+            VersionDownloadCandidate::builtin(VersionDownloadSource::GhProxy),
+            VersionDownloadCandidate::builtin(VersionDownloadSource::GhFast),
         ]
     );
 }
 
+#[test]
+fn custom_mirror_urls_are_normalized_and_join_the_fallback_chain() {
+    assert_eq!(
+        normalize_custom_download_mirror_url(" https://mirror.example.com/base ").unwrap(),
+        "https://mirror.example.com/base/"
+    );
+    assert!(normalize_custom_download_mirror_url("http://mirror.example.com/").is_err());
+    assert!(normalize_custom_download_mirror_url("https://mirror.example.com/?token=x").is_err());
+
+    let mirrors = vec![
+        "https://first.example.com/".to_string(),
+        "https://second.example.com/".to_string(),
+    ];
+    let candidates = version_download_source_candidates(
+        VersionDownloadCandidate::custom(&mirrors[1]),
+        true,
+        &mirrors,
+    );
+    assert_eq!(candidates[0], VersionDownloadCandidate::custom(&mirrors[1]));
+    assert_eq!(
+        candidates.last(),
+        Some(&VersionDownloadCandidate::custom(&mirrors[0]))
+    );
+    assert_eq!(
+        candidates
+            .iter()
+            .filter(|candidate| candidate.custom_url.is_some())
+            .count(),
+        2
+    );
+}
+
+#[test]
+fn custom_mirror_is_used_for_portable_update_downloads() {
+    let asset = portable_update_test_asset("1.2.3", "amd64");
+    let source = VersionDownloadCandidate::custom("https://mirror.example.com/");
+    let urls = portable_update_download_urls(&asset, &source);
+    assert!(urls[0].starts_with("https://mirror.example.com/https://github.com/"));
+    assert_eq!(update_download_source_name(&urls[0]), "mirror.example.com");
+    assert_eq!(update_download_source_name(&urls[1]), "GitHub");
+}
+
 #[test]
 fn portable_update_state_supports_cancellation_and_snapshot_recovery() {
     let state = AppUpdateState::default();
@@ -624,7 +683,7 @@ fn synthetic_core_release_uses_gitcode_as_download_fallback() {
     let release = release_from_tag_for_repositories(
         "7.2.80",
         Some(repository),
-        VersionDownloadSource::Github,
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::Github),
     );
     let platform = CorePlatform {
         os: "windows".to_string(),
@@ -672,7 +731,7 @@ fn github_proxy_core_release_uses_proxy_then_official_and_gitcode() {
     let release = release_from_tag_for_repositories(
         "v7.2.80",
         Some("lzt404/CLIProxyAPI"),
-        VersionDownloadSource::GhFast,
+        &VersionDownloadCandidate::builtin(VersionDownloadSource::GhFast),
     );
     let platform = CorePlatform {
         os: "windows".to_string(),
diff --git a/src-tauri/src/tests/core_config.rs b/src-tauri/src/tests/core_config.rs
index b711419..b8e98f7 100644
--- a/src-tauri/src/tests/core_config.rs
+++ b/src-tauri/src/tests/core_config.rs
@@ -1040,6 +1040,8 @@ fn startup_preserves_all_user_owned_yaml_and_only_applies_gui_managed_values() {
         routing_strategy: "fill-first".to_string(),
         proxy_url: "socks5://127.0.0.1:7890".to_string(),
         download_source: VersionDownloadSource::Github,
+        custom_download_mirrors: Vec::new(),
+        active_custom_download_mirror: String::new(),
         prefer_gitcode_downloads: false,
         routing_session_affinity: true,
         routing_session_affinity_ttl: "1h".to_string(),
diff --git a/src-tauri/src/usage.rs b/src-tauri/src/usage.rs
index 9dd2bdb..298bbab 100644
--- a/src-tauri/src/usage.rs
+++ b/src-tauri/src/usage.rs
@@ -3328,6 +3328,8 @@ mod tests {
             routing_strategy: "round-robin".to_string(),
             proxy_url: String::new(),
             download_source: VersionDownloadSource::Github,
+            custom_download_mirrors: Vec::new(),
+            active_custom_download_mirror: String::new(),
             prefer_gitcode_downloads: false,
             routing_session_affinity: false,
             routing_session_affinity_ttl: String::new(),
diff --git a/src/i18n/ja.ts b/src/i18n/ja.ts
index de6962a..a698bd8 100644
--- a/src/i18n/ja.ts
+++ b/src/i18n/ja.ts
@@ -973,11 +973,23 @@ export const jaOverrides = {
   'kernel.versions.noBundled': 'このリリースには組み込みコアが含まれていません',
   'kernel.versions.offlineInstall': 'オフラインインストール',
   'kernel.versions.downloadSource': 'ダウンロード元を切り替える',
-  'kernel.versions.downloadSourceHint': 'ソフトウェアとコアの更新確認・ダウンロードでは選択した経路を優先し、失敗時は他の利用可能なソースに切り替えます。ミラープロキシは第三者が提供します。',
+  'kernel.versions.downloadSourceHint': '組み込み経路を選択するか、カスタム HTTPS ミラープレフィックスを追加できます。確認失敗時は自動的に切り替えます。ミラープロキシは第三者が提供します。',
   'kernel.versions.source.github': 'GitHub 公式',
   'kernel.versions.source.gitcode': 'GitCode 中国向けミラー',
   'kernel.versions.source.ghProxy': 'GitHub ミラー · gh-proxy.com',
   'kernel.versions.source.ghFast': 'GitHub ミラー · ghfast.top',
+  'kernel.versions.source.custom': 'カスタムミラー',
+  'kernel.versions.customMirrorPlaceholder': 'ミラープレフィックス（例: https://mirror.example.com/）',
+  'kernel.versions.customMirrorAdd': 'カスタムソースを追加',
+  'kernel.versions.customMirrorDialogTitle': 'カスタムダウンロード元を追加',
+  'kernel.versions.customMirrorDialogDescription': 'GitHub ミラープロキシの HTTPS プレフィックスを入力してください。ダウンロード時に元の GitHub URL を末尾へ追加します。',
+  'kernel.versions.customMirrorConfirm': '追加して切り替え',
+  'kernel.versions.customMirrorAdded': 'カスタムミラーを追加して切り替えました',
+  'kernel.versions.customMirrorAddFailed': 'ミラーの追加に失敗しました: {error}',
+  'kernel.versions.customMirrorRemove': 'カスタムソースを削除',
+  'kernel.versions.customMirrorSaved': '追加済みのカスタムソース',
+  'kernel.versions.customMirrorRemoved': 'カスタムミラーを削除しました',
+  'kernel.versions.customMirrorRemoveFailed': 'ミラーの削除に失敗しました: {error}',
   'kernel.versions.gitcodeUnavailable': 'このビルドには完全な GitCode ミラー設定が含まれていません。',
   'kernel.versions.gitcodeSaveFailed': 'ダウンロード元の切り替えに失敗しました: {error}',
   'kernel.access.firstKey': '最初のキー',
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index 9830fc9..e460de3 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -973,11 +973,23 @@ export const en: Record<MessageKey, string> = {
   'kernel.versions.noBundled': 'This release does not include a bundled core',
   'kernel.versions.offlineInstall': 'Offline Install',
   'kernel.versions.downloadSource': 'Switch Download Source',
-  'kernel.versions.downloadSourceHint': 'Software and core update checks and downloads prefer the selected channel, then fall back to other available sources. Mirror proxies are third-party services.',
+  'kernel.versions.downloadSourceHint': 'Choose a built-in channel or add a custom HTTPS mirror prefix. Failed checks automatically fall back. Mirror proxies are third-party services.',
   'kernel.versions.source.github': 'Official GitHub',
   'kernel.versions.source.gitcode': 'GitCode China Mirror',
   'kernel.versions.source.ghProxy': 'GitHub Mirror · gh-proxy.com',
   'kernel.versions.source.ghFast': 'GitHub Mirror · ghfast.top',
+  'kernel.versions.source.custom': 'Custom Mirror',
+  'kernel.versions.customMirrorPlaceholder': 'Mirror prefix, e.g. https://mirror.example.com/',
+  'kernel.versions.customMirrorAdd': 'Add Custom Source',
+  'kernel.versions.customMirrorDialogTitle': 'Add Custom Download Source',
+  'kernel.versions.customMirrorDialogDescription': 'Enter the HTTPS prefix of a GitHub mirror proxy. The original GitHub URL is appended when downloading.',
+  'kernel.versions.customMirrorConfirm': 'Add and Switch',
+  'kernel.versions.customMirrorAdded': 'Custom mirror added and selected',
+  'kernel.versions.customMirrorAddFailed': 'Failed to add mirror: {error}',
+  'kernel.versions.customMirrorRemove': 'Remove custom source',
+  'kernel.versions.customMirrorSaved': 'Added custom sources',
+  'kernel.versions.customMirrorRemoved': 'Custom mirror removed',
+  'kernel.versions.customMirrorRemoveFailed': 'Failed to remove mirror: {error}',
   'kernel.versions.gitcodeUnavailable': 'This build does not include complete GitCode mirror configuration.',
   'kernel.versions.gitcodeSaveFailed': 'Failed to switch download source: {error}',
   'kernel.access.firstKey': 'First key',
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index 350344d..b61a87d 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -971,11 +971,23 @@ export const zhCN = {
   'kernel.versions.noBundled': '当前发行包未包含内置内核',
   'kernel.versions.offlineInstall': '离线安装',
   'kernel.versions.downloadSource': '切换下载源',
-  'kernel.versions.downloadSourceHint': '软件和内核的版本检查及下载将优先使用所选渠道，失败时自动回退到其他可用源。镜像代理由第三方提供。',
+  'kernel.versions.downloadSourceHint': '可选择内置渠道或添加自定义 HTTPS 镜像前缀；检测失败时会自动回退。镜像代理由第三方提供。',
   'kernel.versions.source.github': 'GitHub 官方源',
   'kernel.versions.source.gitcode': 'GitCode 国内源',
   'kernel.versions.source.ghProxy': 'GitHub 镜像 · gh-proxy.com',
   'kernel.versions.source.ghFast': 'GitHub 镜像 · ghfast.top',
+  'kernel.versions.source.custom': '自定义镜像',
+  'kernel.versions.customMirrorPlaceholder': '镜像前缀，例如 https://mirror.example.com/',
+  'kernel.versions.customMirrorAdd': '添加自定义源',
+  'kernel.versions.customMirrorDialogTitle': '添加自定义下载源',
+  'kernel.versions.customMirrorDialogDescription': '填写 GitHub 镜像代理的 HTTPS 前缀。下载时会在该地址后拼接原始 GitHub URL。',
+  'kernel.versions.customMirrorConfirm': '添加并切换',
+  'kernel.versions.customMirrorAdded': '已添加并切换到自定义镜像',
+  'kernel.versions.customMirrorAddFailed': '添加镜像失败：{error}',
+  'kernel.versions.customMirrorRemove': '删除自定义源',
+  'kernel.versions.customMirrorSaved': '已添加的自定义源',
+  'kernel.versions.customMirrorRemoved': '已删除自定义镜像',
+  'kernel.versions.customMirrorRemoveFailed': '删除镜像失败：{error}',
   'kernel.versions.gitcodeUnavailable': '当前构建未配置完整的 GitCode 镜像源。',
   'kernel.versions.gitcodeSaveFailed': '切换下载源失败：{error}',
   'kernel.access.firstKey': '第一个密钥',
diff --git a/src/pages/VersionManagementPage.tsx b/src/pages/VersionManagementPage.tsx
index d96388a..1664187 100644
--- a/src/pages/VersionManagementPage.tsx
+++ b/src/pages/VersionManagementPage.tsx
@@ -10,6 +10,7 @@ import {
   Info,
   RefreshCw,
   RotateCcw,
+  Trash2,
 } from 'lucide-react';
 import { useCoreRuntime } from '../coreRuntime';
 import { useI18n } from '../i18n';
@@ -41,18 +42,27 @@ export type CoreInstallTask = {
 export type VersionSourceSettings = {
   source: VersionDownloadSource;
   gitcodeAvailable: boolean;
+  customMirrors: string[];
 };
 
-export type VersionDownloadSource = 'github' | 'gitcode' | 'gh-proxy' | 'gh-fast';
+export type VersionDownloadSource = string;
 
 function downloadSourceLabel(source: VersionDownloadSource, t: ReturnType<typeof useI18n>['t']) {
-  const keys = {
+  const keys: Record<string, Parameters<typeof t>[0]> = {
     github: 'kernel.versions.source.github',
     gitcode: 'kernel.versions.source.gitcode',
     'gh-proxy': 'kernel.versions.source.ghProxy',
     'gh-fast': 'kernel.versions.source.ghFast',
-  } as const;
-  return t(keys[source]);
+  };
+  if (source.startsWith('custom:')) {
+    const url = source.slice('custom:'.length);
+    try {
+      return `${t('kernel.versions.source.custom')} · ${new URL(url).host}`;
+    } catch {
+      return t('kernel.versions.source.custom');
+    }
+  }
+  return t(keys[source] ?? 'kernel.versions.source.github');
 }
 
 export type MessageType = 'info' | 'success' | 'error';
@@ -131,6 +141,8 @@ export function VersionManagementPage() {
   const [versionSource, setVersionSource] = useState<VersionSourceSettings | null>(null);
   const [versionSourceSaving, setVersionSourceSaving] = useState(false);
   const [versionSourceError, setVersionSourceError] = useState('');
+  const [customMirrorDraft, setCustomMirrorDraft] = useState('');
+  const [customMirrorDialogOpen, setCustomMirrorDialogOpen] = useState(false);
 
   const [toastNotice, setToastNotice] = useState<{
     message: string;
@@ -138,6 +150,7 @@ export function VersionManagementPage() {
   } | null>(null);
 
   const installDialogRef = useRef<HTMLDivElement>(null);
+  const customMirrorInputRef = useRef<HTMLInputElement>(null);
   const latestCheckEpochRef = useRef(0);
   const toastTimerRef = useRef<number | null>(null);
 
@@ -242,6 +255,52 @@ export function VersionManagementPage() {
     }
   };
 
+  const addCustomMirror = async () => {
+    const url = customMirrorDraft.trim();
+    if (!url) return;
+    setVersionSourceSaving(true);
+    setVersionSourceError('');
+    try {
+      const settings = await invoke<VersionSourceSettings>('add_custom_download_mirror', { url });
+      setVersionSource(settings);
+      setCustomMirrorDraft('');
+      setCustomMirrorDialogOpen(false);
+      cachedLatest = null;
+      cachedLatestError = '';
+      setLatest(null);
+      showToast(t('kernel.versions.customMirrorAdded'), 'success');
+      await Promise.allSettled([checkAppUpdate(), checkLatest(true)]);
+    } catch (error) {
+      const message = t('kernel.versions.customMirrorAddFailed', { error: String(error) });
+      setVersionSourceError(message);
+      showToast(message, 'error');
+    } finally {
+      setVersionSourceSaving(false);
+    }
+  };
+
+  const removeCustomMirror = async (url: string) => {
+    const wasSelected = versionSource?.source === `custom:${url}`;
+    setVersionSourceSaving(true);
+    setVersionSourceError('');
+    try {
+      const settings = await invoke<VersionSourceSettings>('remove_custom_download_mirror', {
+        url,
+      });
+      setVersionSource(settings);
+      showToast(t('kernel.versions.customMirrorRemoved'), 'success');
+      if (wasSelected) {
+        await Promise.allSettled([checkAppUpdate(), checkLatest(true)]);
+      }
+    } catch (error) {
+      const message = t('kernel.versions.customMirrorRemoveFailed', { error: String(error) });
+      setVersionSourceError(message);
+      showToast(message, 'error');
+    } finally {
+      setVersionSourceSaving(false);
+    }
+  };
+
   const installVersion = async (version: string) => {
     setInstalling(true);
     setCancellingInstall(false);
@@ -403,6 +462,25 @@ export function VersionManagementPage() {
     };
   }, [installDialogOpen]);
 
+  useEffect(() => {
+    if (!customMirrorDialogOpen) return;
+
+    const previousOverflow = document.body.style.overflow;
+    document.body.style.overflow = 'hidden';
+    window.setTimeout(() => customMirrorInputRef.current?.focus(), 0);
+
+    const closeOnEscape = (event: KeyboardEvent) => {
+      if (event.key === 'Escape' && !versionSourceSaving) {
+        setCustomMirrorDialogOpen(false);
+      }
+    };
+    document.addEventListener('keydown', closeOnEscape);
+    return () => {
+      document.body.style.overflow = previousOverflow;
+      document.removeEventListener('keydown', closeOnEscape);
+    };
+  }, [customMirrorDialogOpen, versionSourceSaving]);
+
   // Derived state calculations
   const latestVersion = latest?.version ?? '';
   const currentVersion = coreStatus?.currentVersion ?? '';
@@ -531,8 +609,24 @@ export function VersionManagementPage() {
                 </option>
                 <option value="gh-proxy">{t('kernel.versions.source.ghProxy')}</option>
                 <option value="gh-fast">{t('kernel.versions.source.ghFast')}</option>
+                {versionSource?.customMirrors.map((url) => (
+                  <option key={url} value={`custom:${url}`}>
+                    {downloadSourceLabel(`custom:${url}`, t)}
+                  </option>
+                ))}
               </select>
             </label>
+            <button
+              type="button"
+              className="version-source-add-button"
+              disabled={versionSourceSaving || appUpdateTask.running || installing}
+              onClick={() => {
+                setVersionSourceError('');
+                setCustomMirrorDialogOpen(true);
+              }}
+            >
+              <span>{t('kernel.versions.customMirrorAdd')}</span>
+            </button>
           </div>
         </div>
 
@@ -680,6 +774,81 @@ export function VersionManagementPage() {
         </div>
       </section>
 
+      {customMirrorDialogOpen ? (
+        <div className="install-dialog-backdrop custom-mirror-dialog-backdrop">
+          <form
+            className="install-dialog app-update-dialog custom-mirror-dialog"
+            role="dialog"
+            aria-modal="true"
+            aria-labelledby="custom-mirror-dialog-title"
+            onSubmit={(event) => {
+              event.preventDefault();
+              void addCustomMirror();
+            }}
+          >
+            <div className="install-dialog-heading">
+              <span>{t('kernel.versions.downloadSource')}</span>
+              <h2 id="custom-mirror-dialog-title">{t('kernel.versions.customMirrorDialogTitle')}</h2>
+            </div>
+            <p className="custom-mirror-dialog-description">
+              {t('kernel.versions.customMirrorDialogDescription')}
+            </p>
+            <input
+              ref={customMirrorInputRef}
+              type="url"
+              value={customMirrorDraft}
+              disabled={versionSourceSaving}
+              placeholder={t('kernel.versions.customMirrorPlaceholder')}
+              aria-label={t('kernel.versions.customMirrorPlaceholder')}
+              onChange={(event) => setCustomMirrorDraft(event.currentTarget.value)}
+            />
+            {versionSourceError ? (
+              <span className="custom-mirror-dialog-error" role="alert">{versionSourceError}</span>
+            ) : null}
+            {versionSource?.customMirrors.length ? (
+              <div className="custom-mirror-dialog-list">
+                <span>{t('kernel.versions.customMirrorSaved')}</span>
+                {versionSource.customMirrors.map((url) => (
+                  <div key={url}>
+                    <span title={url}>{url}</span>
+                    <button
+                      type="button"
+                      disabled={versionSourceSaving}
+                      title={t('kernel.versions.customMirrorRemove')}
+                      aria-label={t('kernel.versions.customMirrorRemove')}
+                      onClick={() => void removeCustomMirror(url)}
+                    >
+                      <Trash2 size={15} aria-hidden="true" />
+                    </button>
+                  </div>
+                ))}
+              </div>
+            ) : null}
+            <div className="app-update-dialog-actions">
+              <button
+                type="button"
+                className="secondary-button"
+                disabled={versionSourceSaving}
+                onClick={() => {
+                  setCustomMirrorDialogOpen(false);
+                  setCustomMirrorDraft('');
+                  setVersionSourceError('');
+                }}
+              >
+                {t('common.cancel')}
+              </button>
+              <button
+                type="submit"
+                className="secondary-button"
+                disabled={!customMirrorDraft.trim() || versionSourceSaving}
+              >
+                <span>{t('kernel.versions.customMirrorConfirm')}</span>
+              </button>
+            </div>
+          </form>
+        </div>
+      ) : null}
+
       {/* Core Update Confirmation Dialog */}
       {confirmUpdateOpen ? (
         <div className="install-dialog-backdrop app-update-dialog-backdrop">
diff --git a/src/styles.css b/src/styles.css
index 27738a2..ce1b15c 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -1073,11 +1073,18 @@ textarea:focus-visible {
   color: var(--theme-9f2d20);
 }
 
-.version-source-control,
 .version-source-control label {
   display: grid;
 }
 
+.version-source-control {
+  display: grid;
+  grid-template-columns: minmax(0, 250px) auto;
+  width: max-content;
+  max-width: 100%;
+  gap: 8px;
+}
+
 .version-source-control select {
   width: 250px;
   max-width: 100%;
@@ -1100,6 +1107,29 @@ textarea:focus-visible {
   opacity: 0.58;
 }
 
+.version-source-add-button {
+  display: inline-flex;
+  min-height: 42px;
+  align-items: center;
+  justify-content: center;
+  gap: 6px;
+  padding: 0 12px;
+  border: 1px solid var(--theme-d5d2cb);
+  border-radius: 8px;
+  background: var(--theme-fffdf8);
+  color: var(--theme-4b4742);
+}
+
+.version-source-add-button:hover:not(:disabled) {
+  border-color: var(--theme-9b958c);
+  background: var(--theme-faf8f2);
+}
+
+.version-source-add-button:disabled {
+  cursor: not-allowed;
+  opacity: 0.58;
+}
+
 .version-card-grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
@@ -1674,6 +1704,15 @@ textarea:focus-visible {
   .version-source-control select {
     width: 100%;
   }
+
+  .version-source-control {
+    grid-template-columns: minmax(0, 1fr) auto;
+    width: 100%;
+  }
+
+  .version-source-add-button {
+    grid-column: 1 / -1;
+  }
 }
 
 .info-list {
@@ -8301,6 +8340,81 @@ body.table-col-resizing * {
   gap: 10px;
 }
 
+.custom-mirror-dialog {
+  width: min(500px, 100%);
+}
+
+.custom-mirror-dialog-description {
+  margin: 0;
+  color: var(--theme-6f6961);
+  font-size: var(--font-size-body);
+  line-height: var(--line-height-relaxed);
+}
+
+.custom-mirror-dialog > input {
+  width: 100%;
+  height: 44px;
+  min-width: 0;
+  padding: 0 12px;
+  border: 1px solid var(--theme-d5d2cb);
+  border-radius: 8px;
+  background: var(--theme-fffdf8);
+  color: var(--theme-2d2a26);
+}
+
+.custom-mirror-dialog-error {
+  color: var(--theme-9f2d20);
+  font-size: var(--font-size-meta);
+  line-height: var(--line-height-body);
+}
+
+.custom-mirror-dialog-list {
+  display: grid;
+  max-height: 150px;
+  gap: 6px;
+  overflow-y: auto;
+}
+
+.custom-mirror-dialog-list > span {
+  color: var(--theme-7a746c);
+  font-size: var(--font-size-meta);
+}
+
+.custom-mirror-dialog-list > div {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 34px;
+  align-items: center;
+  gap: 8px;
+  padding: 6px 6px 6px 10px;
+  border: 1px solid var(--theme-e3e1db);
+  border-radius: 7px;
+  background: var(--theme-faf8f2);
+}
+
+.custom-mirror-dialog-list > div > span {
+  overflow: hidden;
+  color: var(--theme-4b4742);
+  font-size: var(--font-size-meta);
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.custom-mirror-dialog-list button {
+  display: grid;
+  width: 30px;
+  height: 30px;
+  place-items: center;
+  padding: 0;
+  border: 0;
+  border-radius: 6px;
+  background: transparent;
+  color: var(--theme-9f2d20);
+}
+
+.custom-mirror-dialog-list button:hover:not(:disabled) {
+  background: rgba(159, 45, 32, 0.08);
+}
+
 .app-update-dialog .install-dialog-message {
   display: flex;
   align-items: center;