diff --git a/frontend/src/router/__tests__/guards.spec.ts b/frontend/src/router/__tests__/guards.spec.ts
index 076b943d..a27aaa12 100644
--- a/frontend/src/router/__tests__/guards.spec.ts
+++ b/frontend/src/router/__tests__/guards.spec.ts
@@ -1,5 +1,6 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest'
 import { setActivePinia, createPinia } from 'pinia'
+import { resolveCompletedSetupRedirectPath } from '@/router/setupRedirect'
 
 // Mock 导航加载状态
 vi.mock('@/composables/useNavigationLoading', () => {
@@ -53,6 +54,7 @@ interface MockAuthState {
   isSimpleMode: boolean
   backendModeEnabled: boolean
   hasPendingAuthSession: boolean
+  setupNeedsSetup?: boolean
 }
 
 /**
@@ -66,6 +68,10 @@ function simulateGuard(
   const requiresAuth = toMeta.requiresAuth !== false
   const requiresAdmin = toMeta.requiresAdmin === true
 
+  if (toPath === '/setup' && authState.setupNeedsSetup === false) {
+    return resolveCompletedSetupRedirectPath(authState.isAuthenticated, authState.isAdmin)
+  }
+
   // 不需要认证的路由
   if (!requiresAuth) {
     if (
@@ -378,6 +384,32 @@ describe('路由守卫逻辑', () => {
       expect(redirect).toBeNull()
     })
 
+    it('unauthenticated: initialized /setup redirects to /login', () => {
+      const authState: MockAuthState = {
+        isAuthenticated: false,
+        isAdmin: false,
+        isSimpleMode: false,
+        backendModeEnabled: true,
+        hasPendingAuthSession: false,
+        setupNeedsSetup: false,
+      }
+      const redirect = simulateGuard('/setup', { requiresAuth: false }, authState)
+      expect(redirect).toBe('/login')
+    })
+
+    it('admin: initialized /setup redirects to /admin/dashboard', () => {
+      const authState: MockAuthState = {
+        isAuthenticated: true,
+        isAdmin: true,
+        isSimpleMode: false,
+        backendModeEnabled: true,
+        hasPendingAuthSession: false,
+        setupNeedsSetup: false,
+      }
+      const redirect = simulateGuard('/setup', { requiresAuth: false }, authState)
+      expect(redirect).toBe('/admin/dashboard')
+    })
+
     it('admin: /admin/dashboard is allowed', () => {
       const authState: MockAuthState = {
         isAuthenticated: true,
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index 656421cc..13905af5 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -9,6 +9,8 @@ import { useAppStore } from '@/stores/app'
 import { useAdminSettingsStore } from '@/stores/adminSettings'
 import { useNavigationLoadingState } from '@/composables/useNavigationLoading'
 import { useRoutePrefetch } from '@/composables/useRoutePrefetch'
+import { getSetupStatus } from '@/api/setup'
+import { resolveCompletedSetupRedirectPath } from './setupRedirect'
 import { resolveDocumentTitle } from './title'
 
 /**
@@ -694,7 +696,7 @@ function isBackendModePublicRouteAllowed(path: string, hasPendingAuthSession: bo
   return false
 }
 
-router.beforeEach((to, _from, next) => {
+router.beforeEach(async (to, _from, next) => {
   // 开始导航加载状态
   navigationLoading.startNavigation()
 
@@ -729,6 +731,18 @@ router.beforeEach((to, _from, next) => {
   const requiresAuth = to.meta.requiresAuth !== false // Default to true
   const requiresAdmin = to.meta.requiresAdmin === true
 
+  if (to.path === '/setup') {
+    try {
+      const status = await getSetupStatus()
+      if (!status.needs_setup) {
+        next(resolveCompletedSetupRedirectPath(authStore.isAuthenticated, authStore.isAdmin))
+        return
+      }
+    } catch {
+      // If setup status cannot be determined, keep the setup page reachable.
+    }
+  }
+
   // If route doesn't require auth, allow access
   if (!requiresAuth) {
     // If already authenticated and trying to access login/register, redirect to appropriate dashboard
diff --git a/frontend/src/router/setupRedirect.ts b/frontend/src/router/setupRedirect.ts
new file mode 100644
index 00000000..0169928d
--- /dev/null
+++ b/frontend/src/router/setupRedirect.ts
@@ -0,0 +1,7 @@
+export function resolveCompletedSetupRedirectPath(isAuthenticated: boolean, isAdmin: boolean): string {
+  if (!isAuthenticated) {
+    return '/login'
+  }
+
+  return isAdmin ? '/admin/dashboard' : '/dashboard'
+}