diff --git a/src/web/pages/DownstreamKeys.test.tsx b/src/web/pages/DownstreamKeys.test.tsx
index 546c0a1..d5bd40d 100644
--- a/src/web/pages/DownstreamKeys.test.tsx
+++ b/src/web/pages/DownstreamKeys.test.tsx
@@ -569,6 +569,73 @@ describe('DownstreamKeys page', () => {
     }
   });
 
+  it('defaults new keys to all exact models and all group routes before saving', async () => {
+    apiMock.getRoutesLite.mockResolvedValue([
+      { id: 11, modelPattern: 'claude-*', displayName: '默认群组', enabled: true },
+      { id: 12, modelPattern: 'gpt-4.1-mini', displayName: 'GPT 4.1 Mini', enabled: true },
+      { id: 13, modelPattern: 're:^gemini-2\\..*$', displayName: 'Gemini 全家桶', enabled: true },
+      { id: 14, modelPattern: 'claude-opus-4-6', displayName: 'Claude Opus 4.6', enabled: true },
+    ]);
+
+    let root!: WebTestRenderer;
+    try {
+      await act(async () => {
+        root = create(
+          <MemoryRouter initialEntries={['/downstream-keys']}>
+            <ToastProvider>
+              <DownstreamKeys />
+            </ToastProvider>
+          </MemoryRouter>,
+        );
+      });
+      await flushMicrotasks();
+
+      const createBtn = root!.root.findAll((node) => node.type === 'button' && collectText(node).includes('新增下游密钥'))[0];
+      await act(async () => {
+        createBtn.props.onClick();
+      });
+      await flushMicrotasks();
+
+      const advancedBtn = root!.root.findAll((node) => node.type === 'button' && collectText(node).includes('高级配置'))[0];
+      await act(async () => {
+        advancedBtn.props.onClick();
+      });
+      await flushMicrotasks();
+
+      const panels = root!.root.findAll((node) => node.props.className === 'downstream-key-advanced-panel');
+      const modelPanel = panels.find((node) => collectText(node).includes('模型白名单'));
+      const groupPanel = panels.find((node) => collectText(node).includes('群组范围'));
+      expect(modelPanel).toBeTruthy();
+      expect(groupPanel).toBeTruthy();
+      expect(collectText(modelPanel!)).toContain('已选 2 个模型');
+      expect(collectText(groupPanel!)).toContain('已选 2 个群组');
+
+      const inputs = root!.root.findAllByType('input');
+      const nameInput = inputs.find((node) => node.props.placeholder === '例如：项目 A / 移动端');
+      const keyInput = inputs.find((node) => node.props.placeholder === 'sk-...');
+      await act(async () => {
+        nameInput!.props.onChange({ target: { value: 'default-all-key' } });
+        keyInput!.props.onChange({ target: { value: 'sk-default-all-key-0323' } });
+      });
+      await flushMicrotasks();
+
+      const saveBtn = root!.root.findAll((node) => node.type === 'button' && collectText(node).includes('创建密钥'))[0];
+      await act(async () => {
+        saveBtn.props.onClick();
+      });
+      await flushMicrotasks();
+
+      expect(apiMock.createDownstreamApiKey).toHaveBeenCalledWith(expect.objectContaining({
+        name: 'default-all-key',
+        key: 'sk-default-all-key-0323',
+        supportedModels: ['claude-opus-4-6', 'gpt-4.1-mini'],
+        allowedRouteIds: [11, 13],
+      }));
+    } finally {
+      root?.unmount();
+    }
+  });
+
   it('uses backend batch api for selected rows', async () => {
     let root!: WebTestRenderer;
     try {
diff --git a/src/web/pages/DownstreamKeys.tsx b/src/web/pages/DownstreamKeys.tsx
index 1dd8ae7..a2f6a0f 100644
--- a/src/web/pages/DownstreamKeys.tsx
+++ b/src/web/pages/DownstreamKeys.tsx
@@ -85,6 +85,7 @@ type BatchMetadataForm = {
   tags: string[];
 };
 
+type DefaultRouteSelections = Pick<EditorForm, 'selectedModels' | 'selectedGroupRouteIds'>;
 function toDateTimeLocal(isoString: string | null | undefined): string {
   if (!isoString) return '';
   const ts = Date.parse(isoString);
@@ -138,6 +139,21 @@ function uniqIds(values: number[]): number[] {
   return [...new Set(values.map((value) => Number(value)).filter((value) => Number.isFinite(value) && value > 0).map((value) => Math.trunc(value)))];
 }
 
+function buildDefaultRouteSelections(routeOptions: RouteSelectorItem[]): DefaultRouteSelections {
+  return {
+    selectedModels: uniqStrings(
+      routeOptions
+        .filter((item) => isExactModelPattern(item.modelPattern))
+        .map((item) => item.modelPattern),
+    ).sort((a, b) => a.localeCompare(b)),
+    selectedGroupRouteIds: uniqIds(
+      routeOptions
+        .filter(isGroupRouteOption)
+        .map((item) => item.id),
+    ),
+  };
+}
+
 function parseTagText(value: string): string[] {
   return normalizeTags(value.split(/[\r\n,，]+/g));
 }
@@ -279,7 +295,21 @@ function DownstreamKeyCopyIconButton({ fullKey }: { fullKey: string | undefined
   );
 }
 
-function buildEditorForm(item?: ManagedItem | DownstreamApiKeyItem | null): EditorForm {
+function buildEditorForm(
+  item?: ManagedItem | DownstreamApiKeyItem | null,
+  routeOptions: RouteSelectorItem[] = [],
+  selectAllByDefault = false,
+): EditorForm {
+  const defaultSelections = selectAllByDefault
+    ? buildDefaultRouteSelections(routeOptions)
+    : { selectedModels: [], selectedGroupRouteIds: [] };
+  const selectedModels = Array.isArray(item?.supportedModels)
+    ? item.supportedModels
+    : defaultSelections.selectedModels;
+  const selectedGroupRouteIds = Array.isArray(item?.allowedRouteIds)
+    ? item.allowedRouteIds
+    : defaultSelections.selectedGroupRouteIds;
+
   return {
     name: item?.name || '',
     key: item?.key || '',
@@ -290,8 +320,8 @@ function buildEditorForm(item?: ManagedItem | DownstreamApiKeyItem | null): Edit
     maxRequests: item?.maxRequests === null || item?.maxRequests === undefined ? '' : String(item.maxRequests),
     expiresAt: toDateTimeLocal(item?.expiresAt),
     enabled: item?.enabled ?? true,
-    selectedModels: uniqStrings(Array.isArray(item?.supportedModels) ? item!.supportedModels : []),
-    selectedGroupRouteIds: uniqIds(Array.isArray(item?.allowedRouteIds) ? item!.allowedRouteIds : []),
+    selectedModels: uniqStrings(selectedModels),
+    selectedGroupRouteIds: uniqIds(selectedGroupRouteIds),
     siteWeightMultipliersText: JSON.stringify(item?.siteWeightMultipliers || {}, null, 2),
   };
 }
@@ -823,6 +853,7 @@ export default function DownstreamKeys() {
   const [editorOpen, setEditorOpen] = useState(false);
   const [editingId, setEditingId] = useState<number | null>(null);
   const [editorForm, setEditorForm] = useState<EditorForm>(() => buildEditorForm());
+  const [createDefaultsPending, setCreateDefaultsPending] = useState(false);
   const [drawerOpen, setDrawerOpen] = useState(false);
   const [selectedId, setSelectedId] = useState<number | null>(null);
   const [selectedIds, setSelectedIds] = useState<number[]>([]);
@@ -981,9 +1012,33 @@ export default function DownstreamKeys() {
     return acc;
   }, { tokens: 0, requests: 0, cost: 0, enabled: 0 }), [visibleItems]);
 
+  useEffect(() => {
+    if (!editorOpen || editingId !== null || !createDefaultsPending) {
+      return;
+    }
+
+    const defaultSelections = buildDefaultRouteSelections(routeOptions);
+    if (defaultSelections.selectedModels.length === 0 && defaultSelections.selectedGroupRouteIds.length === 0) {
+      return;
+    }
+
+    setEditorForm((prev) => {
+      if (prev.selectedModels.length > 0 || prev.selectedGroupRouteIds.length > 0) {
+        return prev;
+      }
+      return {
+        ...prev,
+        selectedModels: defaultSelections.selectedModels,
+        selectedGroupRouteIds: defaultSelections.selectedGroupRouteIds,
+      };
+    });
+    setCreateDefaultsPending(false);
+  }, [createDefaultsPending, editorOpen, editingId, routeOptions]);
+
   const openCreate = () => {
     setEditingId(null);
-    setEditorForm(buildEditorForm());
+    setEditorForm(buildEditorForm(null, routeOptions, true));
+    setCreateDefaultsPending(true);
     setEditorOpen(true);
   };
 
@@ -998,6 +1053,7 @@ export default function DownstreamKeys() {
 
   const openEdit = (item: ManagedItem) => {
     setEditingId(item.id);
+    setCreateDefaultsPending(false);
     setEditorForm(buildEditorForm(rawItemMap.get(item.id) || item));
     setEditorOpen(true);
   };
@@ -1005,6 +1061,7 @@ export default function DownstreamKeys() {
   const closeEditor = () => {
     setEditorOpen(false);
     setEditingId(null);
+    setCreateDefaultsPending(false);
     setEditorForm(buildEditorForm());
   };