diff --git a/src/web/pages/ModelTester.tsx b/src/web/pages/ModelTester.tsx
index 64de6e3..f3ae2d5 100644
--- a/src/web/pages/ModelTester.tsx
+++ b/src/web/pages/ModelTester.tsx
@@ -53,6 +53,7 @@ import {
   isConversationUploadedFileSupported,
   resolveConversationFileCapability,
 } from './helpers/conversationFileCapabilities.js';
+import DebugPanel from './model-tester/DebugPanel.js';
 import ModernSelect from '../components/ModernSelect.js';
 import { useAnimatedVisibility } from '../components/useAnimatedVisibility.js';
 import { useIsMobile } from '../components/useIsMobile.js';
@@ -3104,102 +3105,15 @@ export default function ModelTester() {
           </div>
         </div>
 
-        {debugPanelPresence.shouldRender && (
-          <div className={`card panel-presence ${debugPanelPresence.isVisible ? '' : 'is-closing'}`.trim()} style={{ padding: 14, minHeight: isMobile ? 'auto' : 680, maxHeight: isMobile ? 'none' : 740, display: 'flex', flexDirection: 'column', order: isMobile ? 3 : 0 }}>
-            <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 10 }}>
-              <h3 style={{ margin: 0, fontSize: 15 }}>调试</h3>
-              <div style={{ fontSize: 11, color: 'var(--color-text-muted)' }}>
-                {debugTimestamp ? new Date(debugTimestamp).toLocaleString() : '--'}
-              </div>
-            </div>
-
-            <div style={{ display: 'flex', gap: 8, marginBottom: 10, flexWrap: 'wrap' }}>
-              <button
-                className="btn btn-ghost"
-                style={{
-                  border: activeDebugTab === DEBUG_TABS.PREVIEW ? '1px solid var(--color-primary)' : '1px solid var(--color-border)',
-                  color: activeDebugTab === DEBUG_TABS.PREVIEW ? 'var(--color-primary)' : 'var(--color-text-secondary)',
-                }}
-                onClick={() => setActiveDebugTab(DEBUG_TABS.PREVIEW)}
-              >
-                预览
-              </button>
-              <button
-                className="btn btn-ghost"
-                style={{
-                  border: activeDebugTab === DEBUG_TABS.REQUEST ? '1px solid var(--color-primary)' : '1px solid var(--color-border)',
-                  color: activeDebugTab === DEBUG_TABS.REQUEST ? 'var(--color-primary)' : 'var(--color-text-secondary)',
-                }}
-                onClick={() => setActiveDebugTab(DEBUG_TABS.REQUEST)}
-              >
-                请求
-              </button>
-              <button
-                className="btn btn-ghost"
-                style={{
-                  border: activeDebugTab === DEBUG_TABS.RESPONSE ? '1px solid var(--color-primary)' : '1px solid var(--color-border)',
-                  color: activeDebugTab === DEBUG_TABS.RESPONSE ? 'var(--color-primary)' : 'var(--color-text-secondary)',
-                }}
-                onClick={() => setActiveDebugTab(DEBUG_TABS.RESPONSE)}
-              >
-                响应
-              </button>
-            </div>
-
-            <div style={{ flex: 1, overflow: 'hidden', border: '1px solid var(--color-border-light)', borderRadius: 'var(--radius-sm)', background: 'var(--color-bg)' }}>
-              <pre style={{
-                margin: 0,
-                padding: 12,
-                fontSize: 12,
-                lineHeight: 1.55,
-                fontFamily: 'var(--font-mono)',
-                whiteSpace: 'pre-wrap',
-                wordBreak: 'break-word',
-                overflow: 'auto',
-                maxHeight: '100%',
-              }}>
-                {debugTabContent || '// 暂无数据'}
-              </pre>
-            </div>
-
-            <div style={{ marginTop: 10, fontSize: 12, fontWeight: 600 }}>时间线</div>
-            <div style={{
-              marginTop: 6,
-              border: '1px solid var(--color-border-light)',
-              borderRadius: 'var(--radius-sm)',
-              padding: 8,
-              minHeight: 120,
-              maxHeight: 170,
-              overflowY: 'auto',
-              background: 'var(--color-bg)',
-            }}>
-              {debugTimeline.length === 0 ? (
-                <div style={{ color: 'var(--color-text-muted)', fontSize: 12 }}>暂无事件。</div>
-              ) : (
-                <div style={{ display: 'flex', flexDirection: 'column', gap: 6 }}>
-                  {debugTimeline.map((item, index) => (
-                    <div key={`${item.at}-${index}`} style={{ fontSize: 11, color: 'var(--color-text-secondary)', lineHeight: 1.45 }}>
-                      <span style={{
-                        display: 'inline-block',
-                        minWidth: 40,
-                        marginRight: 6,
-                        color: item.level === 'error' ? 'var(--color-danger)' : item.level === 'warn' ? 'var(--color-warning)' : 'var(--color-primary)',
-                        fontWeight: 700,
-                        textTransform: 'uppercase',
-                      }}>
-                        {item.level}
-                      </span>
-                      <span style={{ color: 'var(--color-text-muted)', marginRight: 6 }}>
-                        {new Date(item.at).toLocaleTimeString()}
-                      </span>
-                      <span>{item.text}</span>
-                    </div>
-                  ))}
-                </div>
-              )}
-            </div>
-          </div>
-        )}
+        <DebugPanel
+          presence={debugPanelPresence}
+          isMobile={isMobile}
+          debugTimestamp={debugTimestamp}
+          activeDebugTab={activeDebugTab}
+          onTabChange={setActiveDebugTab}
+          debugTabContent={debugTabContent}
+          debugTimeline={debugTimeline}
+        />
       </div>
     </div>
   );
diff --git a/src/web/pages/model-tester/DebugPanel.tsx b/src/web/pages/model-tester/DebugPanel.tsx
new file mode 100644
index 0000000..69705ee
--- /dev/null
+++ b/src/web/pages/model-tester/DebugPanel.tsx
@@ -0,0 +1,144 @@
+import React from 'react';
+import { DEBUG_TABS, type DebugTab } from '../helpers/modelTesterSession.js';
+
+type DebugTimelineEntry = {
+  at: string;
+  level: 'info' | 'warn' | 'error';
+  text: string;
+};
+
+type DebugPanelPresence = {
+  shouldRender: boolean;
+  isVisible: boolean;
+};
+
+type DebugPanelProps = {
+  presence: DebugPanelPresence;
+  isMobile: boolean;
+  debugTimestamp: number | null;
+  activeDebugTab: DebugTab;
+  onTabChange: (tab: DebugTab) => void;
+  debugTabContent: string;
+  debugTimeline: DebugTimelineEntry[];
+};
+
+export default function DebugPanel({
+  presence,
+  isMobile,
+  debugTimestamp,
+  activeDebugTab,
+  onTabChange,
+  debugTabContent,
+  debugTimeline,
+}: DebugPanelProps) {
+  if (!presence.shouldRender) {
+    return null;
+  }
+
+  return (
+    <div
+      className={`card panel-presence ${presence.isVisible ? '' : 'is-closing'}`.trim()}
+      style={{
+        padding: 14,
+        minHeight: isMobile ? 'auto' : 680,
+        maxHeight: isMobile ? 'none' : 740,
+        display: 'flex',
+        flexDirection: 'column',
+        order: isMobile ? 3 : 0,
+      }}
+    >
+      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 10 }}>
+        <h3 style={{ margin: 0, fontSize: 15 }}>调试</h3>
+        <div style={{ fontSize: 11, color: 'var(--color-text-muted)' }}>
+          {debugTimestamp ? new Date(debugTimestamp).toLocaleString() : '--'}
+        </div>
+      </div>
+
+      <div style={{ display: 'flex', gap: 8, marginBottom: 10, flexWrap: 'wrap' }}>
+        <button
+          className="btn btn-ghost"
+          style={{
+            border: activeDebugTab === DEBUG_TABS.PREVIEW ? '1px solid var(--color-primary)' : '1px solid var(--color-border)',
+            color: activeDebugTab === DEBUG_TABS.PREVIEW ? 'var(--color-primary)' : 'var(--color-text-secondary)',
+          }}
+          onClick={() => onTabChange(DEBUG_TABS.PREVIEW)}
+        >
+          预览
+        </button>
+        <button
+          className="btn btn-ghost"
+          style={{
+            border: activeDebugTab === DEBUG_TABS.REQUEST ? '1px solid var(--color-primary)' : '1px solid var(--color-border)',
+            color: activeDebugTab === DEBUG_TABS.REQUEST ? 'var(--color-primary)' : 'var(--color-text-secondary)',
+          }}
+          onClick={() => onTabChange(DEBUG_TABS.REQUEST)}
+        >
+          请求
+        </button>
+        <button
+          className="btn btn-ghost"
+          style={{
+            border: activeDebugTab === DEBUG_TABS.RESPONSE ? '1px solid var(--color-primary)' : '1px solid var(--color-border)',
+            color: activeDebugTab === DEBUG_TABS.RESPONSE ? 'var(--color-primary)' : 'var(--color-text-secondary)',
+          }}
+          onClick={() => onTabChange(DEBUG_TABS.RESPONSE)}
+        >
+          响应
+        </button>
+      </div>
+
+      <div style={{ flex: 1, overflow: 'hidden', border: '1px solid var(--color-border-light)', borderRadius: 'var(--radius-sm)', background: 'var(--color-bg)' }}>
+        <pre style={{
+          margin: 0,
+          padding: 12,
+          fontSize: 12,
+          lineHeight: 1.55,
+          fontFamily: 'var(--font-mono)',
+          whiteSpace: 'pre-wrap',
+          wordBreak: 'break-word',
+          overflow: 'auto',
+          maxHeight: '100%',
+        }}>
+          {debugTabContent || '// 暂无数据'}
+        </pre>
+      </div>
+
+      <div style={{ marginTop: 10, fontSize: 12, fontWeight: 600 }}>时间线</div>
+      <div style={{
+        marginTop: 6,
+        border: '1px solid var(--color-border-light)',
+        borderRadius: 'var(--radius-sm)',
+        padding: 8,
+        minHeight: 120,
+        maxHeight: 170,
+        overflowY: 'auto',
+        background: 'var(--color-bg)',
+      }}>
+        {debugTimeline.length === 0 ? (
+          <div style={{ color: 'var(--color-text-muted)', fontSize: 12 }}>暂无事件。</div>
+        ) : (
+          <div style={{ display: 'flex', flexDirection: 'column', gap: 6 }}>
+            {debugTimeline.map((item, index) => (
+              <div key={`${item.at}-${index}`} style={{ fontSize: 11, color: 'var(--color-text-secondary)', lineHeight: 1.45 }}>
+                <span style={{
+                  display: 'inline-block',
+                  minWidth: 40,
+                  marginRight: 6,
+                  color: item.level === 'error' ? 'var(--color-danger)' : item.level === 'warn' ? 'var(--color-warning)' : 'var(--color-primary)',
+                  fontWeight: 700,
+                  textTransform: 'uppercase',
+                }}>
+                  {item.level}
+                </span>
+                <span style={{ color: 'var(--color-text-muted)', marginRight: 6 }}>
+                  {new Date(item.at).toLocaleTimeString()}
+                </span>
+                <span>{item.text}</span>
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
diff --git a/src/web/pages/modelTester.debug-panel.architecture.test.tsx b/src/web/pages/modelTester.debug-panel.architecture.test.tsx
new file mode 100644
index 0000000..6d6ad18
--- /dev/null
+++ b/src/web/pages/modelTester.debug-panel.architecture.test.tsx
@@ -0,0 +1,12 @@
+import { describe, expect, it } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+describe('ModelTester debug panel extraction', () => {
+  it('delegates the debug sidebar to a dedicated model-tester component', () => {
+    const source = readFileSync(resolve(process.cwd(), 'src/web/pages/ModelTester.tsx'), 'utf8').replace(/\r\n/g, '\n');
+
+    expect(source).toContain("import DebugPanel from './model-tester/DebugPanel.js'");
+    expect(source).not.toContain('时间线');
+  });
+});