diff --git a/src/main/java/com/ruoyi/device/domain/impl/ThingsBoardDomainImpl.java b/src/main/java/com/ruoyi/device/domain/impl/ThingsBoardDomainImpl.java
index 51fbd3a..0539a17 100644
--- a/src/main/java/com/ruoyi/device/domain/impl/ThingsBoardDomainImpl.java
+++ b/src/main/java/com/ruoyi/device/domain/impl/ThingsBoardDomainImpl.java
@@ -247,22 +247,13 @@ public class ThingsBoardDomainImpl implements IThingsBoardDomain {
         try {
             DeviceId gatewayId = new DeviceId(UUID.fromString(gatewayDeviceId));
 
-            // 构建查询参数：从网关出发查询子设备
-            // direction = FROM 表示从 rootId 出发的关系（网关 -> 子设备）
-            RelationsSearchParameters parameters = new RelationsSearchParameters(
-                gatewayId,                      // rootId: 网关设备ID
-                EntitySearchDirection.FROM,     // direction: 从网关出发
-                1,                              // maxLevel: 查询深度为1（直接子设备）
-                RelationTypeGroup.COMMON,       // relationTypeGroup: COMMON
-                false                           // fetchLastLevelOnly: false
+            // 调用 findInfoByFrom 查询从网关出发的关系信息
+            // 对应前端 API: GET /api/relations/info?fromId=xxx&fromType=DEVICE&relationTypeGroup=COMMON
+            List<EntityRelationInfo> relationInfos = client.findInfoByFrom(
+                gatewayId,
+                RelationTypeGroup.COMMON
             );
 
-            EntityRelationsQuery query = new EntityRelationsQuery();
-            query.setParameters(parameters);
-
-            // 调用 findInfoByQuery 查询关系信息
-            List<EntityRelationInfo> relationInfos = client.findInfoByQuery(query);
-
             if (relationInfos == null || relationInfos.isEmpty()) {
                 log.debug("网关 {} 没有子设备", gatewayDeviceId);
                 return childDeviceIds;