diff --git a/README.md b/README.md
index 545503d..a84c6f3 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # A股工具 · 用户体系
 
-基于 **Go + PostgreSQL + Docker Compose** 的用户权限管理模块，角色覆盖：系统管理员、管理员、用户、游客。前端界面复用 `refer/` 目录下的暗色主题设计语言。
+基于 **Go + PostgreSQL + Docker Compose** 的用户权限管理模块，角色覆盖：系统管理员、管理员、用户。前端界面复用 `refer/` 目录下的暗色主题设计语言。
 
 ## 技术栈
 
@@ -50,13 +50,11 @@ WHERE username = '你的用户名';
 | 系统管理员 | 管理管理员、用户、系统配置 |
 | 管理员 | 管理普通用户 |
 | 用户 | 访问业务功能、修改个人资料 |
-| 游客 | 仅查看公开内容，不可操作 |
 
 ## 主要 API
 
 | 方法 | 路径 | 说明 | 权限 |
 |---|---|---|---|
-| GET | /api/public | 公开信息 | 公开 |
 | POST | /api/auth/register | 注册（默认 user） | 公开 |
 | POST | /api/auth/login | 登录 | 公开 |
 | GET | /api/auth/me | 当前用户 | 需登录 |
@@ -107,5 +105,4 @@ npm run dev
 ## 注意事项
 
 - 生产环境请务必修改 `JWT_SECRET`。
-- 游客通过首页直接访问，无需登录。
 - 首次启动时 GORM 会自动创建表并插入默认角色。
diff --git a/backend/internal/handlers/admin.go b/backend/internal/handlers/admin.go
index 2c8f0b2..3b66ec4 100644
--- a/backend/internal/handlers/admin.go
+++ b/backend/internal/handlers/admin.go
@@ -20,9 +20,9 @@ type AdminHandler struct {
 func allowedRolesForCreation(actor models.RoleName) []models.RoleName {
 	switch actor {
 	case models.RoleSystemAdmin:
-		return []models.RoleName{models.RoleAdmin, models.RoleUser, models.RoleGuest}
+		return []models.RoleName{models.RoleAdmin, models.RoleUser}
 	case models.RoleAdmin:
-		return []models.RoleName{models.RoleUser, models.RoleGuest}
+		return []models.RoleName{models.RoleUser}
 	default:
 		return nil
 	}
diff --git a/backend/internal/handlers/auth.go b/backend/internal/handlers/auth.go
index d79e71b..9fdd4ae 100644
--- a/backend/internal/handlers/auth.go
+++ b/backend/internal/handlers/auth.go
@@ -153,13 +153,6 @@ func (h *AuthHandler) Logout(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "登出成功"})
 }
 
-func (h *AuthHandler) PublicInfo(c *gin.Context) {
-	c.JSON(http.StatusOK, gin.H{
-		"message":       "欢迎访问 A股工具公开信息",
-		"guest_allowed": true,
-	})
-}
-
 func hashPassword(password string) (string, error) {
 	bytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
 	return string(bytes), err
diff --git a/backend/internal/middleware/auth.go b/backend/internal/middleware/auth.go
index c29303e..c728854 100644
--- a/backend/internal/middleware/auth.go
+++ b/backend/internal/middleware/auth.go
@@ -19,6 +19,11 @@ type CurrentUser struct {
 	Role     models.RoleName
 }
 
+var publicPaths = map[string]struct{}{
+	"/api/auth/register": {},
+	"/api/auth/login":    {},
+}
+
 func AuthMiddleware(cfg *config.Config, db *gorm.DB) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		authHeader := c.GetHeader("Authorization")
@@ -41,6 +46,17 @@ func AuthMiddleware(cfg *config.Config, db *gorm.DB) gin.HandlerFunc {
 			}
 		}
 
+		if _, exists := c.Get("currentUser"); !exists {
+			if c.Request.Method == "OPTIONS" {
+				c.Next()
+				return
+			}
+			if _, ok := publicPaths[c.Request.URL.Path]; !ok {
+				c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"success": false, "error": "访问令牌无效或已过期"})
+				return
+			}
+		}
+
 		c.Next()
 	}
 }
diff --git a/backend/internal/models/user.go b/backend/internal/models/user.go
index dea9733..ec037e9 100644
--- a/backend/internal/models/user.go
+++ b/backend/internal/models/user.go
@@ -13,7 +13,6 @@ const (
 	RoleSystemAdmin RoleName = "system_admin"
 	RoleAdmin       RoleName = "admin"
 	RoleUser        RoleName = "user"
-	RoleGuest       RoleName = "guest"
 )
 
 func (r RoleName) String() string { return string(r) }
@@ -43,10 +42,8 @@ func ParseRoleName(s string) (RoleName, error) {
 		return RoleAdmin, nil
 	case "user":
 		return RoleUser, nil
-	case "guest":
-		return RoleGuest, nil
 	default:
-		return RoleGuest, fmt.Errorf("unknown role: %s", s)
+		return "", fmt.Errorf("unknown role: %s", s)
 	}
 }
 
@@ -105,7 +102,6 @@ func SeedRoles(db *gorm.DB) error {
 		{Name: string(RoleSystemAdmin), Description: strPtr("系统管理员，可管理管理员与系统配置"), Permissions: `["*"]`},
 		{Name: string(RoleAdmin), Description: strPtr("管理员，可管理普通用户"), Permissions: `["users.read", "users.write", "users.create"]`},
 		{Name: string(RoleUser), Description: strPtr("普通用户，可访问业务功能"), Permissions: `["dashboard.read", "profile.write"]`},
-		{Name: string(RoleGuest), Description: strPtr("游客，仅可查看公开内容"), Permissions: `["public.read"]`},
 	}
 	for _, role := range roles {
 		var existing Role
diff --git a/backend/internal/routes/routes.go b/backend/internal/routes/routes.go
index a57925c..e12cfe9 100644
--- a/backend/internal/routes/routes.go
+++ b/backend/internal/routes/routes.go
@@ -30,8 +30,7 @@ func Setup(cfg *config.Config, db *gorm.DB) *gin.Engine {
 
 	r.Use(middleware.AuthMiddleware(cfg, db))
 
-	// 公开接口
-	r.GET("/api/public", authHandler.PublicInfo)
+	// 公开接口（仅登录/注册）
 	r.POST("/api/auth/register", authHandler.Register)
 	r.POST("/api/auth/login", authHandler.Login)
 
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index ac792c8..0b6f696 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -10,14 +10,14 @@ export interface UserInfo {
   id: string
   username: string
   email?: string
-  role: 'system_admin' | 'admin' | 'user' | 'guest'
+  role: 'system_admin' | 'admin' | 'user'
   status: string
   created_at: string
 }
 
 export interface Role {
   id: number
-  name: 'system_admin' | 'admin' | 'user' | 'guest'
+  name: 'system_admin' | 'admin' | 'user'
   description?: string
   permissions: string[]
   created_at: string
@@ -79,9 +79,6 @@ async function request<T>(
 }
 
 export const api = {
-  publicInfo: () =>
-    request<{ message: string; guest_allowed: boolean }>('/api/public'),
-
   register: (body: { username: string; email?: string; password: string }) =>
     request<AuthResponse>('/api/auth/register', {
       method: 'POST',
diff --git a/frontend/src/lib/auth.ts b/frontend/src/lib/auth.ts
index 03e46da..e7ecd71 100644
--- a/frontend/src/lib/auth.ts
+++ b/frontend/src/lib/auth.ts
@@ -30,13 +30,12 @@ export function clearAuth() {
   localStorage.removeItem('user')
 }
 
-export type RoleName = 'system_admin' | 'admin' | 'user' | 'guest'
+export type RoleName = 'system_admin' | 'admin' | 'user'
 
 const ROLE_RANK: Record<RoleName, number> = {
   system_admin: 3,
   admin: 2,
   user: 1,
-  guest: 0,
 }
 
 export function roleRank(role: RoleName): number {
@@ -51,8 +50,6 @@ export function roleLabel(role: RoleName): string {
       return '管理员'
     case 'user':
       return '用户'
-    case 'guest':
-      return '游客'
   }
 }
 
diff --git a/frontend/src/pages/Dashboard.tsx b/frontend/src/pages/Dashboard.tsx
index 3782de2..0a41e7e 100644
--- a/frontend/src/pages/Dashboard.tsx
+++ b/frontend/src/pages/Dashboard.tsx
@@ -1,16 +1,9 @@
-import { useEffect, useState } from 'react'
-import { LayoutDashboard, Globe, ShieldCheck } from 'lucide-react'
-import { api } from '@/lib/api'
+import { LayoutDashboard, ShieldCheck } from 'lucide-react'
 import { getStoredUser, roleLabel } from '@/lib/auth'
 
 export function Dashboard() {
-  const [publicInfo, setPublicInfo] = useState<{ message: string } | null>(null)
   const user = getStoredUser()
 
-  useEffect(() => {
-    api.publicInfo().then(setPublicInfo).catch(() => null)
-  }, [])
-
   return (
     <div className="space-y-6">
       <div className="flex items-center gap-3">
@@ -19,7 +12,7 @@ export function Dashboard() {
         </div>
         <div>
           <h1 className="text-xl font-bold text-foreground">看板</h1>
-          <p className="text-sm text-secondary">欢迎回来，{user?.username || '游客'}</p>
+          <p className="text-sm text-secondary">欢迎回来，{user?.username || '—'}</p>
         </div>
       </div>
 
@@ -27,14 +20,8 @@ export function Dashboard() {
         <Card
           icon={<ShieldCheck className="h-5 w-5 text-accent" />}
           title="当前身份"
-          value={user ? roleLabel(user.role) : '游客'}
-          desc={user ? `用户：${user.username}` : '未登录，仅可查看公开信息'}
-        />
-        <Card
-          icon={<Globe className="h-5 w-5 text-bear" />}
-          title="公开信息"
-          value="已接入"
-          desc={publicInfo?.message || '加载中…'}
+          value={user ? roleLabel(user.role) : '—'}
+          desc={user ? `用户：${user.username}` : '加载中…'}
         />
       </div>
 
@@ -44,7 +31,6 @@ export function Dashboard() {
           <li><span className="text-accent font-medium">系统管理员</span>：可管理管理员、用户、系统配置</li>
           <li><span className="text-accent font-medium">管理员</span>：可管理普通用户</li>
           <li><span className="text-accent font-medium">用户</span>：可访问业务功能、修改个人资料</li>
-          <li><span className="text-accent font-medium">游客</span>：仅查看公开内容，不可操作</li>
         </ul>
       </div>
     </div>
diff --git a/frontend/src/router.tsx b/frontend/src/router.tsx
index f87dda4..470663c 100644
--- a/frontend/src/router.tsx
+++ b/frontend/src/router.tsx
@@ -10,7 +10,11 @@ export const router = createBrowserRouter([
   { path: '/login', element: <Login /> },
   {
     path: '/',
-    element: <Layout />,
+    element: (
+      <AuthGuard requireAuth>
+        <Layout />
+      </AuthGuard>
+    ),
     children: [
       { index: true, element: <Dashboard /> },
       {
@@ -23,11 +27,7 @@ export const router = createBrowserRouter([
       },
       {
         path: 'profile',
-        element: (
-          <AuthGuard requireAuth>
-            <Profile />
-          </AuthGuard>
-        ),
+        element: <Profile />,
       },
     ],
   },