diff --git a/README.md b/README.md
index 7ed21f7..09f4a2a 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ npm start
 
 默认会在浏览器打开：
 
-- `http://localhost:3003/`
+- `http://localhost:8081/`
 
 如未自动打开，可手动在浏览器输入上述地址访问。
 
@@ -67,6 +67,21 @@ REACT_APP_API_BASE_URL=http://115.190.223.209:5232/api
 
 你可以根据实际后端地址进行修改。
 
+## OIDC 单点登录联动
+
+前端已与后端认证流程联动：
+
+1. 应用启动时调用 `GET /api/auth/me` 读取当前 Session 用户。
+2. 若未登录（401），前端自动跳转 `/api/login?next=<当前页面>`。
+3. 后端回调成功后会带着 `next` 回跳到前端原页面。
+4. 业务 API 请求若返回 401，也会自动触发登录跳转。
+
+相关实现文件：
+
+- `src/services/auth.js`：登录跳转、退出、用户信息获取
+- `src/services/api.js`：axios 401 拦截并跳转登录
+- `src/App.jsx`：应用初始化时鉴权和用户显示
+
 ## 功能说明
 
 - 左侧侧边栏
diff --git a/package.json b/package.json
index 070e2b9..a19bff6 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "xlsx": "^0.18.5"
   },
   "scripts": {
-    "start": "react-scripts start",
+    "start": "set PORT=8081 && react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
     "eject": "react-scripts eject"
diff --git a/src/App.css b/src/App.css
index 91a4622..a0c2513 100644
--- a/src/App.css
+++ b/src/App.css
@@ -128,7 +128,6 @@ body {
 .header-actions {
   display: flex;
   gap: 20px;
-  cursor: pointer;
   margin-left: auto;
 }
 
@@ -140,33 +139,105 @@ body {
   height: 100%;
 }
 
+.user-trigger {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 38px;
+  height: 38px;
+  padding: 0;
+  border: 1px solid #ececec;
+  border-radius: 999px;
+  background: linear-gradient(180deg, #ffffff 0%, #f7f7f7 100%);
+  color: #4b5563;
+  cursor: pointer;
+  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
+  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
+}
+
+.user-trigger.has-name {
+  justify-content: flex-start;
+  width: auto;
+  max-width: 220px;
+  padding: 0 12px 0 8px;
+  gap: 8px;
+  border-radius: 999px;
+}
+
+.user-trigger:hover {
+  border-color: #d8dee8;
+  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
+}
+
+.user-avatar {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  border-radius: 999px;
+  background: linear-gradient(180deg, #77c7ff 0%, #4b9dff 100%);
+  color: #fff;
+  flex: 0 0 auto;
+}
+
+.user-name {
+  max-width: 150px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  font-size: 14px;
+  color: #374151;
+}
+
 .user-tooltip {
   display: none;
   position: absolute;
-  top: 30px;
-  right: -10px;
-  background: #333;
-  color: #fff;
-  padding: 6px 10px;
-  border-radius: 4px;
-  font-size: 12px;
-  white-space: nowrap;
+  top: calc(100% + 10px);
+  right: 0;
+  min-width: 120px;
+  padding: 8px;
+  background: #fff;
+  border: 1px solid #ececec;
+  border-radius: 12px;
+  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
   z-index: 100;
-  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
 }
 
 .user-tooltip::before {
   content: '';
   position: absolute;
-  top: -4px;
-  right: 14px;
-  width: 8px;
-  height: 8px;
-  background: #333;
+  top: -6px;
+  right: 18px;
+  width: 12px;
+  height: 12px;
+  background: #fff;
+  border-top: 1px solid #ececec;
+  border-left: 1px solid #ececec;
   transform: rotate(45deg);
 }
 
-.user-profile:hover .user-tooltip {
+.user-menu-item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  width: 100%;
+  padding: 10px 12px;
+  border: none;
+  border-radius: 10px;
+  background: #fff;
+  color: #111827;
+  font-size: 14px;
+  cursor: pointer;
+  transition: background 0.2s ease, color 0.2s ease;
+}
+
+.user-menu-item:hover {
+  background: #f5f7fb;
+}
+
+.user-profile:hover .user-tooltip,
+.user-profile:focus-within .user-tooltip {
   display: block;
 }
 
@@ -314,10 +385,6 @@ body {
   background: #40a9ff;
 }
 
-.table-container {
-  /* 让外层 page-scroll 负责滚动，这里不再额外横向滚动 */
-}
-
 .loading {
   text-align: center;
   padding: 40px;
diff --git a/src/App.jsx b/src/App.jsx
index e2caaf0..db4e1fc 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -1,13 +1,19 @@
 // App.jsx
 import React, { useState, useEffect } from 'react';
 import {
-  User,
   ChevronDown,
+  User,
   X
 } from 'lucide-react';
 import './App.css';
 import FstTagPage from './pages/FstTagPage';
 import VersionListPage from './pages/VersionListPage';
+import {
+  getCurrentUser,
+  isAuthCallbackPath,
+  redirectToLogin,
+  relayAuthCallbackToBackend
+} from './services/auth';
 
 const App = () => {
   // 页面组件注册表
@@ -59,6 +65,45 @@ const App = () => {
     return defaultTabs;
   });
 
+  const [currentUser, setCurrentUser] = useState(null);
+  const [authLoading, setAuthLoading] = useState(true);
+  const displayName = currentUser?.name || currentUser?.preferred_username || '';
+
+  useEffect(() => {
+    if (isAuthCallbackPath()) {
+      relayAuthCallbackToBackend();
+      return;
+    }
+
+    let mounted = true;
+
+    const loadUser = async () => {
+      try {
+        const data = await getCurrentUser();
+        if (mounted) {
+          setCurrentUser(data.user || null);
+          setAuthLoading(false);
+        }
+      } catch (error) {
+        if (mounted) {
+          if (error?.status === 401) {
+            // 未登录，立即重定向，不显示 Loading 界面
+            setAuthLoading(false);
+            redirectToLogin();
+            return;
+          }
+          setAuthLoading(false);
+        }
+      }
+    };
+
+    loadUser();
+
+    return () => {
+      mounted = false;
+    };
+  }, []);
+
   // 监听 activeTab 变化，同步到 URL
   useEffect(() => {
     const slug = pageToSlug[activeTab];
@@ -110,6 +155,10 @@ const App = () => {
     });
   };
 
+  if (authLoading) {
+    return <div className="app-container">Loading...</div>;
+  }
+
   return (
     <div className="app-container">
       <aside className="sidebar">
@@ -162,8 +211,20 @@ const App = () => {
         <header className="top-header">
           <div className="header-actions">
             <div className="user-profile">
-              <User size={20} />
-              <div className="user-tooltip">用户中心</div>
+              <button
+                type="button"
+                className={`user-trigger${displayName ? ' has-name' : ''}`}
+                aria-label="用户菜单"
+              >
+                <span className="user-avatar">
+                  <User size={16} />
+                </span>
+                {displayName && (
+                  <span className="user-name" title={displayName}>
+                    {displayName}
+                  </span>
+                )}
+              </button>
             </div>
           </div>
         </header>
diff --git a/src/services/api.js b/src/services/api.js
index 255bc6d..862da90 100644
--- a/src/services/api.js
+++ b/src/services/api.js
@@ -1,4 +1,5 @@
 import axios from 'axios';
+import { redirectToLogin, redirectToServerLoginUrl } from './auth';
 
 const isDev = process.env.NODE_ENV === 'development';
 const baseURL = isDev
@@ -8,6 +9,7 @@ const baseURL = isDev
 const instance = axios.create({
   baseURL,
   timeout: 10000,
+  withCredentials: true,
   headers: {
     'Content-Type': 'application/json'
   }
@@ -31,6 +33,7 @@ instance.interceptors.response.use(
       switch (error.response.status) {
         case 401:
           console.error('未授权，请登录');
+          redirectToServerLoginUrl(error.response?.data?.login_url);
           break;
         case 403:
           console.error('没有权限');
diff --git a/src/services/auth.js b/src/services/auth.js
new file mode 100644
index 0000000..45fe443
--- /dev/null
+++ b/src/services/auth.js
@@ -0,0 +1,64 @@
+const isDev = process.env.NODE_ENV === 'development';
+const authBaseUrl = isDev
+  ? (process.env.REACT_APP_AUTH_BASE_URL || 'http://localhost:5232')
+  : '';
+
+const CALLBACK_PATH = '/api/daimler/authorized';
+
+// Check if current path is the auth callback path (for backward compatibility)
+export const isAuthCallbackPath = () => {
+  return window.location.pathname === CALLBACK_PATH;
+};
+
+// Relay auth callback to backend (used when SSO callbacks to frontend)
+export const relayAuthCallbackToBackend = () => {
+  const query = window.location.search || '';
+  window.location.replace(`${authBaseUrl}${CALLBACK_PATH}${query}`);
+};
+
+const normalizeNextUrl = () => {
+  const raw = window.location.href || `${window.location.origin}/`;
+  const parsed = new URL(raw);
+  const route = `${parsed.pathname}${parsed.search}${parsed.hash}`;
+
+  // Prevent recursive redirects when client accidentally lands on auth routes.
+  if (route.startsWith('/api/login') || route.startsWith('/api/daimler/authorized')) {
+    return `${window.location.origin}`;
+  }
+
+  return raw;
+};
+
+export const buildLoginUrl = () => {
+  const nextUrl = normalizeNextUrl();
+  return `${authBaseUrl}/api/login?next=${encodeURIComponent(nextUrl)}`;
+};
+
+export const redirectToLogin = () => {
+  window.location.href = buildLoginUrl();
+};
+
+export const redirectToServerLoginUrl = (loginUrl) => {
+  if (!loginUrl) {
+    redirectToLogin();
+    return;
+  }
+
+  // Backward compatibility: backend may still return /api/auth/login.
+  window.location.href = loginUrl;
+};
+
+export const getCurrentUser = async () => {
+  const response = await fetch('/api/auth/me', {
+    method: 'GET',
+    credentials: 'include'
+  });
+
+  if (!response.ok) {
+    const error = new Error('Unauthorized');
+    error.status = response.status;
+    throw error;
+  }
+
+  return response.json();
+};