diff --git a/frontend/src/i18n/locales/en.json b/frontend/src/i18n/locales/en.json
index 88cb16d..3fc7b8a 100644
--- a/frontend/src/i18n/locales/en.json
+++ b/frontend/src/i18n/locales/en.json
@@ -186,5 +186,10 @@
     "lastMonth": "Last Month",
     "thisYear": "This Year",
     "lastYear": "Last Year"
+  },
+  "maintenance": {
+    "title": "System Upgrade",
+    "message": "The system is under maintenance. Expected to resume at 23:59 tonight. Please wait patiently.",
+    "estimatedTime": "Estimated recovery: 23:59 tonight"
   }
-}
+}
\ No newline at end of file
diff --git a/frontend/src/i18n/locales/es.json b/frontend/src/i18n/locales/es.json
index d8fcaf7..c6c3f8c 100644
--- a/frontend/src/i18n/locales/es.json
+++ b/frontend/src/i18n/locales/es.json
@@ -161,5 +161,10 @@
     "lastMonth": "Mes Pasado",
     "thisYear": "Este Año",
     "lastYear": "Año Pasado"
+  },
+  "maintenance": {
+    "title": "Actualización del sistema",
+    "message": "El sistema está en mantenimiento. Se espera que se reanude a las 23:59 de esta noche. Por favor, espere pacientemente.",
+    "estimatedTime": "Hora estimada de recuperación: 23:59 esta noche"
   }
-}
+}
\ No newline at end of file
diff --git a/frontend/src/i18n/locales/fr.json b/frontend/src/i18n/locales/fr.json
index 0922bdd..9cea65a 100644
--- a/frontend/src/i18n/locales/fr.json
+++ b/frontend/src/i18n/locales/fr.json
@@ -161,5 +161,10 @@
     "lastMonth": "Mois Dernier",
     "thisYear": "Cette Année",
     "lastYear": "Année Dernière"
+  },
+  "maintenance": {
+    "title": "Mise à jour du système",
+    "message": "Le système est en maintenance. Reprise prévue à 23h59 ce soir. Veuillez patienter.",
+    "estimatedTime": "Heure de reprise estimée : 23h59 ce soir"
   }
-}
+}
\ No newline at end of file
diff --git a/frontend/src/i18n/locales/ru.json b/frontend/src/i18n/locales/ru.json
index 206daa5..9d34ee0 100644
--- a/frontend/src/i18n/locales/ru.json
+++ b/frontend/src/i18n/locales/ru.json
@@ -161,5 +161,10 @@
     "lastMonth": "В прошлом месяце",
     "thisYear": "В этом году",
     "lastYear": "В прошлом году"
+  },
+  "maintenance": {
+    "title": "Обновление системы",
+    "message": "Система находится на техническом обслуживании. Ожидаемое восстановление в 23:59 сегодня. Пожалуйста, подождите.",
+    "estimatedTime": "Ожидаемое восстановление: сегодня 23:59"
   }
-}
+}
\ No newline at end of file
diff --git a/frontend/src/i18n/locales/zh.json b/frontend/src/i18n/locales/zh.json
index 9209488..ae5c709 100644
--- a/frontend/src/i18n/locales/zh.json
+++ b/frontend/src/i18n/locales/zh.json
@@ -186,5 +186,10 @@
     "lastMonth": "上月",
     "thisYear": "今年",
     "lastYear": "去年"
+  },
+  "maintenance": {
+    "title": "系统升级中",
+    "message": "系统维护升级中，预计今晚 23:59 恢复，请耐心等待",
+    "estimatedTime": "预计恢复时间：今晚 23:59"
   }
-}
+}
\ No newline at end of file
diff --git a/frontend/src/pages/login-simple/index.tsx b/frontend/src/pages/login-simple/index.tsx
index aea3ba6..ca7115d 100644
--- a/frontend/src/pages/login-simple/index.tsx
+++ b/frontend/src/pages/login-simple/index.tsx
@@ -1,16 +1,35 @@
 import { useState } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { Button, Input, Toast } from 'antd-mobile'
+import { useTranslation } from 'react-i18next'
 import { useUserStore } from '@/stores/user'
+import loginStyles from '../login/login.module.css'
 import styles from './login-simple.module.css'
 
+// 维护模式开关 - 恢复时改为 false 重新部署即可
+const MAINTENANCE_MODE = true
+
 export default function SimpleLogin() {
+  const { t } = useTranslation()
   const navigate = useNavigate()
   const { login } = useUserStore()
   const [username, setUsername] = useState('')
   const [password, setPassword] = useState('')
   const [loading, setLoading] = useState(false)
 
+  if (MAINTENANCE_MODE) {
+    return (
+      <div className={loginStyles.login}>
+        <div className={loginStyles.maintenanceContainer}>
+          <div className={loginStyles.maintenanceIcon}>🔧</div>
+          <h1 className={loginStyles.maintenanceTitle}>{t('maintenance.title')}</h1>
+          <p className={loginStyles.maintenanceMessage}>{t('maintenance.message')}</p>
+          <p className={loginStyles.maintenanceTime}>{t('maintenance.estimatedTime')}</p>
+        </div>
+      </div>
+    )
+  }
+
   const handleLogin = async () => {
     if (!username || !password) {
       Toast.show('请输入用户名和密码')
diff --git a/frontend/src/pages/login/index.tsx b/frontend/src/pages/login/index.tsx
index f84827d..ac3a2fa 100644
--- a/frontend/src/pages/login/index.tsx
+++ b/frontend/src/pages/login/index.tsx
@@ -1,10 +1,14 @@
 import { useEffect, useState } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { Toast } from 'antd-mobile'
+import { useTranslation } from 'react-i18next'
 import { useUserStore } from '@/stores/user'
 import QRCodeLogin from './QRCodeLogin'
 import styles from './login.module.css'
 
+// 维护模式开关 - 恢复时改为 false 重新部署即可
+const MAINTENANCE_MODE = true
+
 // 声明飞书 JSAPI 类型
 declare global {
   interface Window {
@@ -16,6 +20,7 @@ declare global {
 }
 
 export default function Login() {
+  const { t } = useTranslation()
   const navigate = useNavigate()
   const { login } = useUserStore()
   const [loading, setLoading] = useState(true)
@@ -23,6 +28,19 @@ export default function Login() {
   const [showQRCode, setShowQRCode] = useState(false)
   const [shouldSkipAutoLogin, setShouldSkipAutoLogin] = useState(false) // 防止重复执行免登
 
+  if (MAINTENANCE_MODE) {
+    return (
+      <div className={styles.login}>
+        <div className={styles.maintenanceContainer}>
+          <div className={styles.maintenanceIcon}>🔧</div>
+          <h1 className={styles.maintenanceTitle}>{t('maintenance.title')}</h1>
+          <p className={styles.maintenanceMessage}>{t('maintenance.message')}</p>
+          <p className={styles.maintenanceTime}>{t('maintenance.estimatedTime')}</p>
+        </div>
+      </div>
+    )
+  }
+
   // 检查登录状态
   useEffect(() => {
     const urlParams = new URLSearchParams(window.location.search)
diff --git a/frontend/src/pages/login/login.module.css b/frontend/src/pages/login/login.module.css
index 04b470d..3d26255 100644
--- a/frontend/src/pages/login/login.module.css
+++ b/frontend/src/pages/login/login.module.css
@@ -102,3 +102,40 @@
     transform: rotate(360deg);
   }
 }
+
+.maintenanceContainer {
+  text-align: center;
+  padding: 40px 30px;
+  max-width: 360px;
+}
+
+.maintenanceIcon {
+  font-size: 64px;
+  margin-bottom: 24px;
+  animation: bounce 2s ease-in-out infinite;
+}
+
+.maintenanceTitle {
+  color: #fff;
+  font-size: 24px;
+  font-weight: 600;
+  margin: 0 0 16px 0;
+}
+
+.maintenanceMessage {
+  color: rgba(255, 255, 255, 0.9);
+  font-size: 16px;
+  line-height: 1.6;
+  margin: 0 0 12px 0;
+}
+
+.maintenanceTime {
+  color: rgba(255, 255, 255, 0.7);
+  font-size: 14px;
+  margin: 0;
+}
+
+@keyframes bounce {
+  0%, 100% { transform: translateY(0); }
+  50% { transform: translateY(-10px); }
+}