diff --git a/services/timer/src/cjson_helper.cpp b/services/timer/src/cjson_helper.cpp
index 75412594a99e0d3fa88395dec99503f58b901eb4..b33f045a769a2a3168692ac7a50cc91ec58e2f29 100644
--- a/services/timer/src/cjson_helper.cpp
+++ b/services/timer/src/cjson_helper.cpp
@@ -107,10 +107,12 @@ cJSON* CjsonHelper::QueryTable(std::string tableName, cJSON* db)
     cJSON* table = cJSON_GetObjectItem(db, tableName.c_str());
     if (table == NULL) {
         TIME_HILOGE(TIME_MODULE_SERVICE, "%{public}s get fail!", tableName.c_str());
+        cJSON_Delete(db);
         return data;
     }
 
     data = table;
+    cJSON_Delete(db);
     return data;
 }