diff --git a/backend/main.py b/backend/main.py
index fc1a3e73..e5da5118 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -265,7 +265,7 @@ class AppServer:
     
     def _initialize_devices(self):
         """
-        初始化设备（在用户登录成功后调用）
+       
         """
         try:
             self.logger.info('开始初始化设备...')
diff --git a/frontend/src/renderer/src/views/Login.vue b/frontend/src/renderer/src/views/Login.vue
index a27ca536..ab290c05 100644
--- a/frontend/src/renderer/src/views/Login.vue
+++ b/frontend/src/renderer/src/views/Login.vue
@@ -426,7 +426,6 @@ const handleRegisterSubmit = async () => {
 
 // 登录处理
 const handleLogin = async () => {
-  isLoading.value = true
   // 验证用户名
   if (!form.value.account) {
     showError('请输入登录账号！')
@@ -439,7 +438,9 @@ const handleLogin = async () => {
     return
   }
   
-  // 网络访问测试（最多重试3次，每次延迟2秒）
+  isLoading.value = true
+  
+  // 网络访问测试（最多重试3次，短退避：200/400/800ms，总上限约 1.4s）
   let healthOk = false
   for (let attempt = 1; attempt <= 3; attempt++) {
     try {
@@ -451,9 +452,11 @@ const handleLogin = async () => {
         // 后台返回非 healthy 状态
         if (attempt === 3) {
           showError('后台服务异常，请稍后重试！')
+          isLoading.value = false
           return
         }
-        await new Promise(resolve => setTimeout(resolve, 2000))
+        const delay = 200 * Math.pow(2, attempt - 1)
+        await new Promise(resolve => setTimeout(resolve, delay))
       }
     } catch (error) {
       // 捕获异常，等待后重试
@@ -462,7 +465,8 @@ const handleLogin = async () => {
         isLoading.value = false
         return
       }
-      await new Promise(resolve => setTimeout(resolve, 2000))
+      const delay = 200 * Math.pow(2, attempt - 1)
+      await new Promise(resolve => setTimeout(resolve, delay))
     }
   }
 
@@ -1210,4 +1214,4 @@ const copyPassword = async () => {
   background: transparent;
 }
 
-</style>
\ No newline at end of file
+</style>