diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 20a3812..b259abb 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -17,6 +17,12 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
+    <!-- 保活：防止 CPU 休眠导致 UDP socket 无法收发包 -->
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+
+    <!-- 电池优化豁免：防止息屏后 Doze 模式限制网络 -->
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+
     <application
         android:name=".App"
         android:allowBackup="true"
diff --git a/android/app/src/main/java/com/tsmobile/app/ConnectionService.kt b/android/app/src/main/java/com/tsmobile/app/ConnectionService.kt
index f84b08c..e4bb26c 100644
--- a/android/app/src/main/java/com/tsmobile/app/ConnectionService.kt
+++ b/android/app/src/main/java/com/tsmobile/app/ConnectionService.kt
@@ -8,18 +8,24 @@ import android.app.Service
 import android.content.Context
 import android.content.Intent
 import android.content.pm.ServiceInfo
+import android.net.Uri
+import android.net.wifi.WifiManager
 import android.os.Build
+import android.os.PowerManager
+import android.provider.Settings
 import androidx.core.app.NotificationCompat
 import androidx.core.app.ServiceCompat
 import androidx.lifecycle.LifecycleService
 
 /**
- * 前台服务：保持与 TeamSpeak 服务器的连接。
+ * 前台服务：保活 TeamSpeak 连接。
+ *
+ * 三层保活策略：
+ *   1. 前台服务通知 → 防止 Android 杀死进程
+ *   2. WakeLock (PARTIAL) → 防止 CPU 休眠导致 UDP socket 无法收发包
+ *   3. WiFi Lock → 防止 WiFi 进入低功耗模式断连
  *
  * 连接成功时启动，断开/被踢时停止。
- * 通过 startForeground() 显示持续通知，防止 Android 杀死进程。
- *
- * 使用 FOREGROUND_SERVICE_TYPE_DATA_SYNC 类型，适合网络数据同步场景。
  */
 class ConnectionService : LifecycleService() {
 
@@ -29,13 +35,15 @@ class ConnectionService : LifecycleService() {
         private const val NOTIFICATION_ID = 1
         const val EXTRA_SERVER_NAME = "server_name"
 
+        /** WakeLock tag */
+        private const val WAKELOCK_TAG = "tsmobile:connection"
+
         /**
          * 启动前台服务。
-         * @param context 上下文
-         * @param serverName 服务器地址（显示在通知中）
          */
         fun start(context: Context, serverName: String) {
             android.util.Log.i(TAG, "Starting connection service for $serverName")
+            requestBatteryExemptionIfNeeded(context)
             val intent = Intent(context, ConnectionService::class.java).apply {
                 putExtra(EXTRA_SERVER_NAME, serverName)
             }
@@ -49,42 +57,114 @@ class ConnectionService : LifecycleService() {
             android.util.Log.i(TAG, "Stopping connection service")
             context.stopService(Intent(context, ConnectionService::class.java))
         }
+
+        /**
+         * 检查电池优化豁免状态，若未豁免则引导用户设置。
+         * 仅在首次调用时弹窗（系统设置页面），用户设置后不再提示。
+         */
+        fun requestBatteryExemptionIfNeeded(context: Context) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return
+
+            val pm = context.getSystemService(POWER_SERVICE) as PowerManager
+            if (pm.isIgnoringBatteryOptimizations(context.packageName)) {
+                android.util.Log.d(TAG, "Already exempt from battery optimization")
+                return
+            }
+
+            android.util.Log.i(TAG, "Requesting battery optimization exemption")
+            try {
+                val intent = Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS).apply {
+                    data = Uri.parse("package:${context.packageName}")
+                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                }
+                context.startActivity(intent)
+            } catch (e: Exception) {
+                android.util.Log.w(TAG, "Failed to open battery optimization settings", e)
+            }
+        }
+    }
+
+    private var wakeLock: PowerManager.WakeLock? = null
+    private var wifiLock: WifiManager.WifiLock? = null
+
+    override fun onCreate() {
+        super.onCreate()
+        acquireWakeLock()
+        acquireWifiLock()
+        ensureChannel()
+        android.util.Log.i(TAG, "Service created, locks acquired")
     }
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         super.onStartCommand(intent, flags, startId)
 
         val serverName = intent?.getStringExtra(EXTRA_SERVER_NAME) ?: ""
-        val notification = buildNotification(serverName)
-
-        // startForeground 前确保通知频道存在
-        ensureChannel()
 
         // 启动前台服务
-        // Android 14+ 需要指定 foregroundServiceType
         val serviceType = if (Build.VERSION.SDK_INT >= 34) {
             ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC
         } else {
             0
         }
-        ServiceCompat.startForeground(this, NOTIFICATION_ID, notification, serviceType)
+        ServiceCompat.startForeground(this, NOTIFICATION_ID, buildNotification(serverName), serviceType)
 
-        android.util.Log.i(TAG, "Foreground service started")
-        // The service exists only to keep the process alive while a TS connection is active.
-        // If Android kills it, there is no reliable way to restore the TS session, so don't
-        // ask the system to recreate it with a misleading "connected" notification.
+        android.util.Log.i(TAG, "Foreground service started for $serverName")
         return Service.START_NOT_STICKY
     }
 
     override fun onDestroy() {
+        releaseLocks()
         super.onDestroy()
-        android.util.Log.i(TAG, "Connection service destroyed")
+        android.util.Log.i(TAG, "Connection service destroyed, locks released")
     }
 
-    /**
-     * 确保通知频道已创建。
-     * Android 8.0+ 需要通知频道，重复创建是安全的（系统会忽略已存在的频道）。
-     */
+    // ── WakeLock ───────────────────────────────────────────────
+
+    @Suppress("DEPRECATION")
+    private fun acquireWakeLock() {
+        val pm = getSystemService(POWER_SERVICE) as PowerManager
+        wakeLock = pm.newWakeLock(
+            PowerManager.PARTIAL_WAKE_LOCK,
+            WAKELOCK_TAG,
+        ).apply {
+            acquire()
+        }
+        android.util.Log.i(TAG, "WakeLock acquired (PARTIAL)")
+    }
+
+    private fun releaseLocks() {
+        wakeLock?.let {
+            if (it.isHeld) {
+                it.release()
+                android.util.Log.i(TAG, "WakeLock released")
+            }
+        }
+        wakeLock = null
+
+        wifiLock?.let {
+            if (it.isHeld) {
+                it.release()
+                android.util.Log.i(TAG, "WiFi lock released")
+            }
+        }
+        wifiLock = null
+    }
+
+    // ── WiFi Lock ──────────────────────────────────────────────
+
+    private fun acquireWifiLock() {
+        val wm = applicationContext.getSystemService(WIFI_SERVICE) as? WifiManager ?: return
+        wifiLock = wm.createWifiLock(
+            WifiManager.WIFI_MODE_FULL_HIGH_PERF,
+            "tsmobile:wifi",
+        ).apply {
+            acquire()
+        }
+        android.util.Log.i(TAG, "WiFi lock acquired")
+    }
+
+    // ── 通知频道 ───────────────────────────────────────────────
+
     private fun ensureChannel() {
         val nm = getSystemService(NotificationManager::class.java) ?: return
         if (nm.getNotificationChannel(CHANNEL_ID) != null) return
@@ -100,11 +180,7 @@ class ConnectionService : LifecycleService() {
         nm.createNotificationChannel(channel)
     }
 
-    /**
-     * 构建通知。
-     */
     private fun buildNotification(serverName: String): Notification {
-        // 点击通知回到 MainActivity
         val pendingIntent = PendingIntent.getActivity(
             this,
             0,
@@ -119,8 +195,8 @@ class ConnectionService : LifecycleService() {
             .setContentTitle("已连接到 TeamSpeak")
             .setContentText(serverName)
             .setPriority(NotificationCompat.PRIORITY_LOW)
-            .setOngoing(true)        // 不可滑动清除
-            .setShowWhen(false)       // 不显示时间
+            .setOngoing(true)
+            .setShowWhen(false)
             .setContentIntent(pendingIntent)
             .build()
     }
diff --git a/android/app/src/main/java/com/tsmobile/app/viewmodel/ServerViewModel.kt b/android/app/src/main/java/com/tsmobile/app/viewmodel/ServerViewModel.kt
index 5e49adb..6f940c3 100644
--- a/android/app/src/main/java/com/tsmobile/app/viewmodel/ServerViewModel.kt
+++ b/android/app/src/main/java/com/tsmobile/app/viewmodel/ServerViewModel.kt
@@ -168,17 +168,23 @@ class ServerViewModel(application: Application) : AndroidViewModel(application)
         // 启动时自动检查更新
         checkForUpdate()
 
-        // 网络变动检测 — 简单原则：
-        //   任何 NetworkCallback 触发 + 已连接 → 网络一定变了 → 必须重连
-        //   （UDP socket 绑定在旧 IP 上，即使 isAvailable 不变也已死）
+        // 网络变动检测：
+        //   任何 NetworkCallback 触发 + 前台 + 已连接 → 重连（UDP socket 绑定在旧 IP 上已死）
+        //   后台忽略：Android 挂起应用时可能限制网络导致误触发，
+        //     真正的断线由 Go idle timeout（60s 无包）兜底，或回到前台时检测
         //
         //   两层 collector：
-        //   1. networkChangeCount → 任何网络事件 → Connected 就重连
-        //   2. isAvailable false→true → WaitingForNetwork 时网络恢复 → 重连
+        //   1. networkChangeCount → 任何网络事件 → Connected 就重连（仅前台）
+        //   2. isAvailable false→true → WaitingForNetwork 时网络恢复 → 重连（不限前后台）
         viewModelScope.launch {
             var firstEmission = true
             networkMonitor.networkChangeCount.collect { _ ->
                 if (firstEmission) { firstEmission = false; return@collect }
+                // 后台忽略：防止 Android 后台网络限制导致 NetworkCallback 误触发
+                if (!isAppInForeground()) {
+                    android.util.Log.d(TAG, "Network change ignored (app in background)")
+                    return@collect
+                }
                 if (_connectionState.value is ConnectionState.Connected) {
                     android.util.Log.w(TAG, "Network changed while connected, reconnecting")
                     val chId = Repository.currentChannelId.value
@@ -208,6 +214,10 @@ class ServerViewModel(application: Application) : AndroidViewModel(application)
         }
     }
 
+    /** 应用是否在前台（RESUMED 状态） */
+    private fun isAppInForeground(): Boolean =
+        ProcessLifecycleOwner.get().lifecycle.currentState == Lifecycle.State.RESUMED
+
     override fun onCleared() {
         super.onCleared()
         networkMonitor.stop()