diff --git a/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java b/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java
index be303118..6374c025 100644
--- a/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java
+++ b/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java
@@ -263,12 +263,14 @@ public class GnssDeviceController extends BasicController{
                 if(!old_device.getGroup_id().equals(device.getGroup_id())){
                     device.setSyn(false);
                 }
+                int changeFlag = device.getChange_flag();
                 if(diff.contains("has_battery")){
-                    device.setChange_flag(GnssDevice.PARA_MASK_HAS_BATTERY);
+                    changeFlag |= GnssDevice.PARA_MASK_HAS_BATTERY;
                 }
                 if(diff.contains("voltage_factor")){
-                    device.setChange_flag(GnssDevice.PARA_MASK_VOLTAGE_FACTOR);
+                    changeFlag |= GnssDevice.PARA_MASK_VOLTAGE_FACTOR;
                 }
+                device.setChange_flag(changeFlag);
                 num = gnssDeviceMapper.updateById(device);
             }
         }