diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java b/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
index 64b9ac19..1479ccf2 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
@@ -19,6 +19,7 @@ import android.view.Menu;
 import android.view.MenuItem;
 import android.widget.TextView;
 
+import com.dev.devapi.api.SysApi;
 import com.xypower.common.MicroPhotoContext;
 
 import java.text.SimpleDateFormat;
@@ -182,7 +183,12 @@ public class MainActivity extends AppCompatActivity {
         Context context = getApplicationContext();
         MicroPhotoContext.AppConfig appConfig = MicroPhotoContext.getMpAppConfig(context);
         StringBuilder stringBuilder = new StringBuilder();
-        stringBuilder.append("CMDID：" + (TextUtils.isEmpty(appConfig.cmdid) ? "" : appConfig.cmdid));
+        if (TextUtils.isEmpty(appConfig.cmdid)) {
+            stringBuilder.append("CMDID：" + SysApi.getSerialNo(getApplicationContext()) + " (SN)");
+         } else {
+            stringBuilder.append("CMDID："appConfig.cmdid);
+        }
+
 
         MicroPhotoContext.MasterConfig masterConfig = MicroPhotoContext.getMasterConfig(context);
         stringBuilder.append("\r\n");