diff --git a/data-center-business-service/src/main/java/com/techsor/datacenter/business/service/impl/DeviceServiceImpl.java b/data-center-business-service/src/main/java/com/techsor/datacenter/business/service/impl/DeviceServiceImpl.java
index 4c50fe3..2211544 100644
--- a/data-center-business-service/src/main/java/com/techsor/datacenter/business/service/impl/DeviceServiceImpl.java
+++ b/data-center-business-service/src/main/java/com/techsor/datacenter/business/service/impl/DeviceServiceImpl.java
@@ -348,7 +348,7 @@ public class DeviceServiceImpl implements IDeviceService {
                 deviceInfo.setUnit("");
             }
             if (StringUtils.isBlank(deviceUpdateParams.getDataMapping())) {
-                deviceInfo.setDataMapping("");
+                deviceInfo.setDataMapping("{}");
             }
             this.deviceInfoMapperExt.updateByPrimaryKeySelective(deviceInfo);
 
@@ -953,7 +953,7 @@ public class DeviceServiceImpl implements IDeviceService {
                         deviceInfo.setUnit(deviceInfoExcel.getUnit());
                     }
                     if (StringUtils.isBlank(deviceInfoExcel.getDataMapping())){
-                        deviceInfo.setDataMapping("");
+                        deviceInfo.setDataMapping("{}");
                     } else {
                         deviceInfo.setDataMapping(deviceInfoExcel.getDataMapping());
                     }