diff --git a/modules/thing/src/main/java/com/thing/device/source/service/IotThingSourceService.java b/modules/thing/src/main/java/com/thing/device/source/service/IotThingSourceService.java
index fcd88bc..be79a95 100644
--- a/modules/thing/src/main/java/com/thing/device/source/service/IotThingSourceService.java
+++ b/modules/thing/src/main/java/com/thing/device/source/service/IotThingSourceService.java
@@ -49,5 +49,7 @@ public interface IotThingSourceService extends IBaseService<IotThingSourceEntity
 
     List<String> attrGroup();
 
+    Long getMaxSort(String configType,Long fromId,Long rootId);
+
     List<IotThingSourceDTO> attrGroupRootId(IotThingSourceReqDTO iotThingSourceDTO);
 }
diff --git a/modules/thing/src/main/java/com/thing/device/source/service/impl/IotThingSourceServiceImpl.java b/modules/thing/src/main/java/com/thing/device/source/service/impl/IotThingSourceServiceImpl.java
index 88723b4..f26cb84 100644
--- a/modules/thing/src/main/java/com/thing/device/source/service/impl/IotThingSourceServiceImpl.java
+++ b/modules/thing/src/main/java/com/thing/device/source/service/impl/IotThingSourceServiceImpl.java
@@ -566,6 +566,21 @@ public class IotThingSourceServiceImpl extends BaseServiceImpl<IotThingSourceMap
         return strings.stream().filter(s -> !StringUtils.isBlank(s)).distinct().collect(Collectors.toList());
     }
 
+    @Override
+    public Long getMaxSort(String configType, Long fromId,Long rootId)  {
+        List<IotThingSourceEntity> iotThingSourceEntities = mapper.selectListByQuery(
+                new QueryWrapper()
+                        .eq(IotThingSourceEntity::getFromId, fromId)
+                        .eq(IotThingSourceEntity::getConfigType, configType)
+                        .eq(IotThingSourceEntity::getRootId, rootId)
+                        .eq(IotThingSourceEntity::getTenantCode, UserContext.getRealTenantCode())
+        );
+        if(CollectionUtils.isEmpty(iotThingSourceEntities)){
+            return 0L;
+        }
+        return iotThingSourceEntities.stream().max(Comparator.comparing(IotThingSourceEntity::getSort)).get().getSort()+1;
+    }
+
     @Override
     public List<IotThingSourceDTO> attrGroupRootId(IotThingSourceReqDTO iotThingSourceDTO) {
         List<IotThingSourceRelationDTO> iotThingSourceRelationDTOList = iotThingSourceDTO.getIotThingSourceRelationDTOList();