diff --git a/apps/mini/scripts/visual-check.mjs b/apps/mini/scripts/visual-check.mjs
index a22e7ed..5c1eac0 100644
--- a/apps/mini/scripts/visual-check.mjs
+++ b/apps/mini/scripts/visual-check.mjs
@@ -36,6 +36,7 @@ const workspace = {
 await page.route('http://localhost:9150/api/v1/**', async (route) => {
   const request = route.request()
   const path = new URL(request.url()).pathname
+  if (path === '/api/v1/status') return route.fulfill({ json: { status: 'unavailable' } })
   if (path === '/api/v1/auth/login') return route.fulfill({ json: { token: 'mini-token' } })
   if (path === '/api/v1/projects') {
     if (request.method() === 'POST') return route.fulfill({ status: 201, json: workspace.project })
@@ -57,6 +58,11 @@ await page.route('http://localhost:9150/api/v1/**', async (route) => {
 })
 
 await page.goto(`http://127.0.0.1:${port}/`, { waitUntil: 'networkidle' })
+await page.waitForSelector('.mini-connection.offline')
+const offlineConnection = await page.locator('.mini-connection').evaluate((element) => ({
+  text: element.textContent,
+  borderColor: getComputedStyle(element).borderColor,
+}))
 await page.screenshot({ path: 'test-results/mini-login.png', fullPage: true })
 const loginDefaults = await page.locator('.login-note input').evaluateAll((inputs) => inputs.map((input) => input.value))
 await page.locator('.login-note input').nth(2).press('Enter')
@@ -96,6 +102,7 @@ await browser.close()
 await server.close()
 
 const failures = []
+if (!offlineConnection.text?.includes('连接异常') || offlineConnection.borderColor !== 'rgb(245, 63, 63)') failures.push(`offline connection must be red: ${JSON.stringify(offlineConnection)}`)
 if (loginDefaults[1] !== 'demo@senlin.ai' || loginDefaults[2] !== 'password123') failures.push(`login defaults failed: ${JSON.stringify(loginDefaults)}`)
 if (errors.length) failures.push(`console errors: ${errors.join('; ')}`)
 if (home.width !== 420) failures.push(`expected 420px shell, got ${home.width}`)
diff --git a/apps/mini/src/App.tsx b/apps/mini/src/App.tsx
index 70db6cd..f4ad3aa 100644
--- a/apps/mini/src/App.tsx
+++ b/apps/mini/src/App.tsx
@@ -5,7 +5,7 @@ import {
   IconFile, IconFolder, IconPlus, IconRefresh, IconRobot, IconSearch, IconSettings,
 } from '@arco-design/web-react/icon'
 import {
-  ApiError, createAISession, createCron, createProject, createTask, fetchAISessions, fetchExperts,
+  ApiError, checkServerConnection, createAISession, createCron, createProject, createTask, fetchAISessions, fetchExperts,
   fetchProjects, fetchWorkspace, login, updateTask, uploadSource,
   type AISession, type ApiSession, type Expert, type Project, type Workspace,
 } from './api'
@@ -14,6 +14,7 @@ const { Text, Title } = Typography
 type View = 'home' | 'tasks' | 'notes' | 'ai' | 'more'
 type DockSide = 'left' | 'right'
 type Action = 'project' | 'task' | 'cron' | null
+type ConnectionStatus = 'checking' | 'online' | 'offline'
 
 const navItems: Array<{ id: View; label: string; icon: React.ReactNode }> = [
   { id: 'home', label: '项目', icon: <IconApps /> },
@@ -311,6 +312,26 @@ function Login({ onLogin }: { onLogin: (session: ApiSession) => void }) {
   const [password, setPassword] = useState('password123')
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState('')
+  const [connection, setConnection] = useState<ConnectionStatus>('checking')
+
+  useEffect(() => {
+    const controller = new AbortController()
+    const timer = window.setTimeout(() => void checkConnection(controller.signal), 300)
+    return () => {
+      controller.abort()
+      window.clearTimeout(timer)
+    }
+  }, [server])
+
+  async function checkConnection(signal?: AbortSignal) {
+    setConnection('checking')
+    try {
+      const online = await checkServerConnection(server, signal)
+      if (!signal?.aborted) setConnection(online ? 'online' : 'offline')
+    } catch (requestError) {
+      if (!(requestError instanceof DOMException && requestError.name === 'AbortError')) setConnection('offline')
+    }
+  }
 
   async function submitLogin() {
     if (loading) return
@@ -332,6 +353,11 @@ function Login({ onLogin }: { onLogin: (session: ApiSession) => void }) {
         <Title heading={3}>森林AI Mini</Title>
         <Text type="secondary">停靠在屏幕一侧，随时记录与推进项目</Text>
         <label>服务器地址<Input value={server} onChange={setServer} /></label>
+        <div className={`mini-connection ${connection}`} role="status">
+          <i />
+          <strong>{connection === 'checking' ? '正在检查' : connection === 'online' ? '连接正常' : '连接异常'}</strong>
+          <button type="button" onClick={() => void checkConnection()}>{connection === 'checking' ? '检查中' : '重新检查'}</button>
+        </div>
         <label>邮箱<Input value={email} onChange={setEmail} /></label>
         <label>密码<Input.Password value={password} onChange={setPassword} /></label>
         {error ? <Alert type="error" content={error} /> : null}
diff --git a/apps/mini/src/api.ts b/apps/mini/src/api.ts
index 5476512..c851320 100644
--- a/apps/mini/src/api.ts
+++ b/apps/mini/src/api.ts
@@ -94,6 +94,18 @@ export async function login(server: string, email: string, password: string): Pr
   return { baseUrl, token: response.token }
 }
 
+export async function checkServerConnection(server: string, signal?: AbortSignal) {
+  try {
+    const response = await fetch(`${normalizeBaseUrl(server)}/api/v1/status`, { signal })
+    if (!response.ok) return false
+    const payload = await response.json() as { timestamp?: unknown }
+    return typeof payload.timestamp === 'string'
+  } catch (error) {
+    if (error instanceof DOMException && error.name === 'AbortError') throw error
+    return false
+  }
+}
+
 export async function fetchProjects(session: ApiSession) {
   useSessionBase(session)
   return request<Project[]>('/api/v1/projects', { token: session.token })
diff --git a/apps/mini/src/styles.css b/apps/mini/src/styles.css
index 9a7c7d1..31bcda8 100644
--- a/apps/mini/src/styles.css
+++ b/apps/mini/src/styles.css
@@ -224,6 +224,12 @@ html[data-dock="left"] .mini-shell { margin-right: auto; }
 .login-note label, .mini-form label { display: grid; gap: 5px; color: #4e5969; font-size: 11px; }
 .login-note .arco-input-wrapper, .mini-form .arco-input-wrapper { border-radius: 9px; background: rgba(255,255,255,.82); }
 .login-note > small { color: var(--muted); text-align: center; }
+.mini-connection { display: grid; grid-template-columns: 9px 1fr auto; align-items: center; gap: 8px; margin-top: -5px; border: 1px solid #bedaff; border-radius: 9px; background: #f2f8ff; padding: 8px 10px; color: #165dff; font-size: 11px; }
+.mini-connection > i { width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
+.mini-connection > strong { font-weight: 600; }
+.mini-connection > button { border: 0; background: transparent; padding: 0; color: inherit; cursor: pointer; font-size: 11px; }
+.mini-connection.online { border-color: #7be188; background: #f0fff4; color: #168a2f; }
+.mini-connection.offline { border-color: #f53f3f; background: #fff2f0; color: #d91d35; }
 
 .mini-modal .arco-modal { width: min(380px, calc(100vw - 24px)); }
 .mini-modal .arco-modal-content { border-radius: 15px; }
diff --git a/apps/web_v1/src/App.css b/apps/web_v1/src/App.css
index 8aa5158..91edaa3 100644
--- a/apps/web_v1/src/App.css
+++ b/apps/web_v1/src/App.css
@@ -191,6 +191,26 @@
   font-weight: 600;
 }
 
+.connection-card.checking {
+  border-color: #bedaff;
+  background: #f2f8ff;
+  color: #165dff;
+}
+
+.connection-card.checking .connection-title {
+  color: #165dff;
+}
+
+.connection-card.offline {
+  border-color: #f53f3f;
+  background: #fff2f0;
+  color: #d91d35;
+}
+
+.connection-card.offline .connection-title {
+  color: #d91d35;
+}
+
 .login-value-panel {
   display: grid;
   align-content: center;