diff --git a/OpenAuth.WebApi/Model/mqtt/ThingOperationHandler.cs b/OpenAuth.WebApi/Model/mqtt/ThingOperationHandler.cs
index 7dcdbbf..6bc064d 100644
--- a/OpenAuth.WebApi/Model/mqtt/ThingOperationHandler.cs
+++ b/OpenAuth.WebApi/Model/mqtt/ThingOperationHandler.cs
@@ -29,7 +29,7 @@ namespace OpenAuth.WebApi.Model.mqtt
                 TaskId = root["TaskId"]?.ToString() ?? "",
                 CreateTime = DateTime.Now,
                 CreateId = long.Parse((root["CreateId"]?.ToString() ?? "0")),
-                Data = Newtonsoft.Json.JsonConvert.SerializeObject(root["Data"]),
+                Data = root["Data"]?.ToJsonString() ?? ""
             });
             //var info = Newtonsoft.Json.JsonConvert.DeserializeObject<LasaControlOperation>(payload);
             //info.Id = Guid.NewGuid().ToString();