diff --git a/app/src/main/java/com/ouxuan/oxface/DebugActivity.java b/app/src/main/java/com/ouxuan/oxface/DebugActivity.java
index 3162966..c3313f2 100644
--- a/app/src/main/java/com/ouxuan/oxface/DebugActivity.java
+++ b/app/src/main/java/com/ouxuan/oxface/DebugActivity.java
@@ -45,6 +45,7 @@ public class DebugActivity extends Activity implements com.kongqw.serialportlibr
     private Ox485 ox485;
     private GateABController gateABController;
     private NetworkEnvironmentManager environmentManager; // 添加环境管理器
+    private com.kongqw.serialportlibrary.SerialPortManager qrSerialPortManager; // 扫码器串口管理器
     
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -56,6 +57,17 @@ public class DebugActivity extends Activity implements com.kongqw.serialportlibr
         setupClickListeners();
     }
     
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        // 清理扫码器串口连接
+        if (qrSerialPortManager != null) {
+            qrSerialPortManager.closeSerialPort();
+            qrSerialPortManager = null;
+            Log.d(TAG, "扫码器串口连接已清理");
+        }
+    }
+    
     private void initViews() {
         tvLogOutput = findViewById(R.id.tvLogOutput);
         logScrollView = findViewById(R.id.logScrollView);
@@ -1043,9 +1055,15 @@ public class DebugActivity extends Activity implements com.kongqw.serialportlibr
     private void testQrScanner() {
         logMessage("启动扫码器测试...");
         try {
-            com.kongqw.serialportlibrary.SerialPortManager serialPortManager = new com.kongqw.serialportlibrary.SerialPortManager();
-            serialPortManager.setOnQrDataListener(this);
-            serialPortManager.x9_serialport_qr();
+            // 如果已经有实例，先清理
+            if (qrSerialPortManager != null) {
+                qrSerialPortManager.closeSerialPort();
+                qrSerialPortManager = null;
+            }
+            
+            qrSerialPortManager = new com.kongqw.serialportlibrary.SerialPortManager();
+            qrSerialPortManager.setOnQrDataListener(this);
+            qrSerialPortManager.x9_serialport_qr();
             logMessage("扫码器测试已启动，请扫描二维码，数据将输出到日志");
             showToast("扫码器测试已启动");
         } catch (Exception e) {