diff --git a/Realtime/Realtime.AOT/Realtime.AOT.csproj b/Realtime/Realtime.AOT/Realtime.AOT.csproj
index 672dc362..ed376e6b 100644
--- a/Realtime/Realtime.AOT/Realtime.AOT.csproj
+++ b/Realtime/Realtime.AOT/Realtime.AOT.csproj
@@ -124,6 +124,9 @@
     <Compile Include="..\Realtime\Internal\Connection\LCRTMHeartBeat.cs">
       <Link>Realtime\Internal\Connection\LCRTMHeartBeat.cs</Link>
     </Compile>
+    <Compile Include="..\Realtime\Public\LCIMException.cs">
+      <Link>Realtime\LCIMException.cs</Link>
+    </Compile>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Resources\link.xml">
diff --git a/Realtime/Realtime/Internal/Connection/LCConnection.cs b/Realtime/Realtime/Internal/Connection/LCConnection.cs
index 5595c47e..c486ce4f 100644
--- a/Realtime/Realtime/Internal/Connection/LCConnection.cs
+++ b/Realtime/Realtime/Internal/Connection/LCConnection.cs
@@ -179,9 +179,11 @@ private void OnMessage(byte[] bytes, int length) {
                             // 错误
                             ErrorCommand error = command.ErrorMessage;
                             int code = error.Code;
-                            string detail = error.Detail;
+                            string reason = error.Reason;
+                            int appCode = error.AppCode;
+                            string appMsg = error.AppMsg;
                             // 包装成异常抛出
-                            LCException exception = new LCException(code, detail);
+                            LCIMException exception = new LCIMException(code, reason, appCode, appMsg);
                             tcs.TrySetException(exception);
                         } else {
                             tcs.TrySetResult(command);
diff --git a/Realtime/Realtime/Internal/Controller/LCIMMessageController.cs b/Realtime/Realtime/Internal/Controller/LCIMMessageController.cs
index 59dcea5a..08cbcc6c 100644
--- a/Realtime/Realtime/Internal/Controller/LCIMMessageController.cs
+++ b/Realtime/Realtime/Internal/Controller/LCIMMessageController.cs
@@ -66,6 +66,11 @@ internal async Task<LCIMMessage> Send(string convId,
             message.Id = ack.Uid;
             message.SentTimestamp = ack.T;
             message.FromClientId = Client.Id;
+
+            if (ack.HasCode) {
+                throw new LCIMException(ack.Code, ack.Reason, ack.AppCode, ack.AppMsg);
+            }
+
             return message;
         }
 
diff --git a/Realtime/Realtime/Public/LCIMException.cs b/Realtime/Realtime/Public/LCIMException.cs
new file mode 100644
index 00000000..6dbc17cd
--- /dev/null
+++ b/Realtime/Realtime/Public/LCIMException.cs
@@ -0,0 +1,14 @@
+
+namespace LeanCloud.Realtime {
+    public class LCIMException : LCException {
+        public int AppCode { get; private set; }
+
+        public string AppMessage { get; private set; }
+
+        public LCIMException(int code, string message, int appCode, string appMessage) :
+            base(code, message) {
+            AppCode = appCode;
+            AppMessage = appMessage;
+        }
+    }
+}