diff --git a/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/ConnectionService.kt b/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/ConnectionService.kt
index 9701776..cead12c 100644
--- a/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/ConnectionService.kt
+++ b/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/ConnectionService.kt
@@ -291,6 +291,34 @@ class ConnectionService : Service() {
             return sendAction(socket, "enter", null)
         }
 
+        fun sendMute(muted: Boolean): Boolean {
+            Log.d("WTS", "ConnectionService.sendMute muted=$muted connected=${state.connected}")
+            val socket = currentSocket ?: return false
+            if (!state.connected) {
+                return false
+            }
+
+            return sendMuteAction(socket, muted)
+        }
+
+        private fun sendMuteAction(socket: WebSocket, muted: Boolean): Boolean {
+            val payload = JSONObject()
+                .put("action", "setMute")
+                .put("muted", muted)
+                .toString()
+            val sent = socket.send(payload)
+            if (!sent && currentSocket == socket) {
+                currentSocket = null
+                updateState(
+                    connected = false,
+                    connecting = false,
+                    lastError = "连接已断开"
+                )
+            }
+
+            return sent
+        }
+
         private fun sendAction(socket: WebSocket, action: String, text: String?): Boolean {
             val payload = JSONObject()
                 .put("action", action)
diff --git a/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/MainActivity.kt b/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/MainActivity.kt
index bb5362f..940b2c9 100644
--- a/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/MainActivity.kt
+++ b/android/app/src/main/kotlin/com/wirelesstextsyncer/wireless_text_syncer_android/MainActivity.kt
@@ -44,6 +44,11 @@ class MainActivity : FlutterActivity() {
                         Log.d(tag, "MethodChannel sendEnter")
                         result.success(ConnectionService.sendEnter())
                     }
+                    "sendMute" -> {
+                        val muted = call.argument<Boolean>("muted") ?: false
+                        Log.d(tag, "MethodChannel sendMute muted=$muted")
+                        result.success(ConnectionService.sendMute(muted))
+                    }
                     "getState" -> {
                         Log.d(tag, "MethodChannel getState")
                         result.success(ConnectionService.stateMap())
diff --git a/lib/main.dart b/lib/main.dart
index 7bc933e..886e12e 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -134,6 +134,13 @@ class NativeConnectionApi {
     return result ?? false;
   }
 
+  Future<bool> sendMute(bool muted) async {
+    final result = await _methodChannel.invokeMethod<bool>('sendMute', {
+      'muted': muted,
+    });
+    return result ?? false;
+  }
+
   Future<List<DiscoveredDevice>> startDiscovery() async {
     try {
       final result = await _methodChannel.invokeListMethod<dynamic>(
@@ -184,6 +191,7 @@ class _InputSyncPageState extends State<InputSyncPage>
   bool headerExpanded = true;
   bool inputFocused = false;
   bool scanning = false;
+  bool desktopMuted = false;
 
   @override
   void initState() {
@@ -265,6 +273,7 @@ class _InputSyncPageState extends State<InputSyncPage>
         }
         if (!nextState.connected) {
           sendButtonState = SendButtonState.idle;
+          desktopMuted = false;
         }
       });
 
@@ -423,6 +432,23 @@ class _InputSyncPageState extends State<InputSyncPage>
     }
   }
 
+  Future<void> _toggleMute() async {
+    if (!connection.connected) {
+      return;
+    }
+    final nextMuted = !desktopMuted;
+    setState(() {
+      desktopMuted = nextMuted;
+    });
+    final sent = await api.sendMute(nextMuted);
+    if (!sent && mounted) {
+      setState(() {
+        desktopMuted = !nextMuted;
+      });
+      _showToast('发送失败，连接已断开');
+    }
+  }
+
   Future<void> _saveHistory(String text) async {
     final trimmed = text.trim();
     if (trimmed.isEmpty) {
@@ -904,6 +930,13 @@ class _InputSyncPageState extends State<InputSyncPage>
                               icon: const Icon(Icons.delete_outline),
                             ),
                     ),
+                    IconButton(
+                      tooltip: desktopMuted ? '取消静音' : '静音桌面',
+                      onPressed: connection.connected ? _toggleMute : null,
+                      icon: Icon(
+                        desktopMuted ? Icons.volume_off : Icons.volume_up,
+                      ),
+                    ),
                   ],
                 ),
               ),