diff --git a/Engine/Handlers/LCClassHookHandler.cs b/Engine/Handlers/LCClassHookHandler.cs
index 20e6351..8ee8698 100644
--- a/Engine/Handlers/LCClassHookHandler.cs
+++ b/Engine/Handlers/LCClassHookHandler.cs
@@ -30,6 +30,13 @@ namespace LeanCloud.Engine {
                 LCObject obj = LCObject.Create(className);
                 obj.Merge(objectData);
 
+                // 避免死循环
+                if (hookName.StartsWith("before")) {
+                    obj.DisableBeforeHook();
+                } else {
+                    obj.DisableAfterHook();
+                }
+
                 LCUser user = null;
                 if (dict.TryGetValue("user", out object userObj) &&
                     userObj != null) {
diff --git a/Engine/LCEngine.cs b/Engine/LCEngine.cs
index 67443e7..554047e 100644
--- a/Engine/LCEngine.cs
+++ b/Engine/LCEngine.cs
@@ -65,6 +65,7 @@ namespace LeanCloud.Engine {
             LCApplication.Initialize(Environment.GetEnvironmentVariable("LEANCLOUD_APP_ID"),
                 Environment.GetEnvironmentVariable("LEANCLOUD_APP_KEY"),
                 Environment.GetEnvironmentVariable("LEANCLOUD_API_SERVER"));
+            LCApplication.AddHeader(LCHookKeyName, Environment.GetEnvironmentVariable("LEANCLOUD_APP_HOOK_KEY"));
 
             Assembly assembly = Assembly.GetCallingAssembly();
             ClassHooks = assembly.GetTypes()