diff --git a/Realtime/Conversation/LCIMConversation.cs b/Realtime/Conversation/LCIMConversation.cs
index d6c76a2..e2ba235 100644
--- a/Realtime/Conversation/LCIMConversation.cs
+++ b/Realtime/Conversation/LCIMConversation.cs
@@ -384,10 +384,10 @@ namespace LeanCloud.Realtime {
                 CreatorId = co as string;
             }
             if (conv.TryGetValue("m", out object mo)) {
-                ids = new HashSet<string>(mo as List<string>);
+                ids = new HashSet<string>((mo as IList<object>).Cast<string>());
             }
             if (conv.TryGetValue("mu", out object muo)) {
-                mutedIds = new HashSet<string>(muo as List<string>);
+                mutedIds = new HashSet<string>((muo as IList<object>).Cast<string>());
             }
         }
 
diff --git a/Realtime/Internal/Controller/LCIMConversationController.cs b/Realtime/Internal/Controller/LCIMConversationController.cs
index f42d2a5..90d4985 100644
--- a/Realtime/Internal/Controller/LCIMConversationController.cs
+++ b/Realtime/Internal/Controller/LCIMConversationController.cs
@@ -462,6 +462,7 @@ namespace LeanCloud.Realtime.Internal.Controller {
                     conversation = new LCIMConversation(Client);
                     Client.ConversationDict[convId] = conversation;
                 }
+
                 conversation.MergeFrom(conv);
                 return conversation;
             }).ToList().AsReadOnly();
diff --git a/Realtime/Internal/Controller/LCIMMessageController.cs b/Realtime/Internal/Controller/LCIMMessageController.cs
index fb18439..1ec3524 100644
--- a/Realtime/Internal/Controller/LCIMMessageController.cs
+++ b/Realtime/Internal/Controller/LCIMMessageController.cs
@@ -85,8 +85,8 @@ namespace LeanCloud.Realtime.Internal.Controller {
             } else if (newMessage is LCIMBinaryMessage binaryMessage) {
                 item.BinaryMsg = ByteString.CopyFrom(binaryMessage.Data);
             }
-            if (newMessage.MentionList != null) {
-                item.MentionPids.AddRange(newMessage.MentionList);
+            if (newMessage.MentionIdList != null) {
+                item.MentionPids.AddRange(newMessage.MentionIdList);
             }
             if (newMessage.MentionAll) {
                 item.MentionAll = newMessage.MentionAll;
@@ -146,43 +146,23 @@ namespace LeanCloud.Realtime.Internal.Controller {
 
         internal override async Task OnNotification(GenericCommand notification) {
             DirectCommand direct = notification.DirectMessage;
-            LCIMMessage message = null;
+            LCIMMessage message;
             if (direct.HasBinaryMsg) {
                 // 二进制消息
                 byte[] bytes = direct.BinaryMsg.ToByteArray();
-                message = new LCIMBinaryMessage(bytes);
+                message = LCIMBinaryMessage.Deserialize(bytes);
             } else {
-                // 文本消息
-                string messageData = direct.Msg;
-                Dictionary<string, object> msgData = JsonConvert.DeserializeObject<Dictionary<string, object>>(messageData,
-                    new LCJsonConverter());
-                int msgType = (int)msgData["_lctype"];
-                switch (msgType) {
-                    case -1:
-                        message = new LCIMTextMessage();
-                        break;
-                    case -2:
-                        message = new LCIMImageMessage();
-                        break;
-                    case -3:
-                        message = new LCIMAudioMessage();
-                        break;
-                    case -4:
-                        message = new LCIMVideoMessage();
-                        break;
-                    case -5:
-                        message = new LCIMLocationMessage();
-                        break;
-                    case -6:
-                        message = new LCIMFileMessage();
-                        break;
-                    default:
-                        break;
-                }
-                message.Decode(direct);
+                // 类型消息
+                message = LCIMTypedMessage.Deserialize(direct.Msg);
             }
+            // 填充消息数据
+            message.ConversationId = direct.Cid;
+            message.Id = direct.Id;
+            message.FromClientId = direct.FromPeerId;
+            message.SentTimestamp = direct.Timestamp;
             // 获取对话
             LCIMConversation conversation = await Client.GetOrQueryConversation(direct.Cid);
+            conversation.LastMessage = message;
             Client.OnMessage?.Invoke(conversation, message);
         }
 
diff --git a/Realtime/Internal/Controller/LCIMUnreadController.cs b/Realtime/Internal/Controller/LCIMUnreadController.cs
index 2364c8d..76b6018 100644
--- a/Realtime/Internal/Controller/LCIMUnreadController.cs
+++ b/Realtime/Internal/Controller/LCIMUnreadController.cs
@@ -2,9 +2,7 @@
 using System.Threading.Tasks;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using Newtonsoft.Json;
 using LeanCloud.Realtime.Protocol;
-using LeanCloud.Storage.Internal;
 
 namespace LeanCloud.Realtime.Internal.Controller {
     internal class LCIMUnreadController : LCIMController {
@@ -22,35 +20,20 @@ namespace LeanCloud.Realtime.Internal.Controller {
             Dictionary<string, LCIMConversation> conversationDict = (await Client.GetConversationList(convIds))
                 .ToDictionary(item => item.Id);
             ReadOnlyCollection<LCIMConversation> conversations = unread.Convs.Select(conv => {
+                // 设置对话中的未读数据
                 LCIMConversation conversation = conversationDict[conv.Cid];
                 conversation.Unread = conv.Unread;
-                // 解析最后一条消息
-                Dictionary<string, object> msgData = JsonConvert.DeserializeObject<Dictionary<string, object>>(conv.Data,
-                    new LCJsonConverter());
-                int msgType = (int)msgData["_lctype"];
+
                 LCIMMessage message = null;
-                switch (msgType) {
-                    case -1:
-                        message = new LCIMTextMessage();
-                        break;
-                    case -2:
-                        message = new LCIMImageMessage();
-                        break;
-                    case -3:
-                        message = new LCIMAudioMessage();
-                        break;
-                    case -4:
-                        message = new LCIMVideoMessage();
-                        break;
-                    case -5:
-                        message = new LCIMLocationMessage();
-                        break;
-                    case -6:
-                        message = new LCIMFileMessage();
-                        break;
-                    default:
-                        break;
+                if (conv.HasBinaryMsg) {
+                    // 二进制消息
+                    byte[] bytes = conv.BinaryMsg.ToByteArray();
+                    message = LCIMBinaryMessage.Deserialize(bytes);
+                } else {
+                    // 类型消息
+                    message = LCIMTypedMessage.Deserialize(conv.Data);
                 }
+                // 填充消息数据
                 message.ConversationId = conv.Cid;
                 message.Id = conv.Mid;
                 message.FromClientId = conv.From;
diff --git a/Realtime/Message/LCIMBinaryMessage.cs b/Realtime/Message/LCIMBinaryMessage.cs
index c720e07..6b590bf 100644
--- a/Realtime/Message/LCIMBinaryMessage.cs
+++ b/Realtime/Message/LCIMBinaryMessage.cs
@@ -10,5 +10,9 @@ namespace LeanCloud.Realtime {
         public LCIMBinaryMessage(byte[] data) {
             Data = data;
         }
+
+        internal static LCIMBinaryMessage Deserialize(byte[] bytes) {
+            return new LCIMBinaryMessage(bytes);
+        }
     }
 }
diff --git a/Realtime/Message/LCIMMessage.cs b/Realtime/Message/LCIMMessage.cs
index 1edd163..3337dec 100644
--- a/Realtime/Message/LCIMMessage.cs
+++ b/Realtime/Message/LCIMMessage.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Collections.Generic;
 using LeanCloud.Realtime.Protocol;
 
@@ -67,7 +68,7 @@ namespace LeanCloud.Realtime {
             }
         }
 
-        public List<string> MentionList {
+        public List<string> MentionIdList {
             get; set;
         }
 
@@ -75,14 +76,11 @@ namespace LeanCloud.Realtime {
             get; set;
         }
 
-        internal LCIMMessage() {
+        public bool Mentioned {
+            get; internal set;
         }
 
-        internal virtual void Decode(DirectCommand direct) {
-            ConversationId = direct.Cid;
-            Id = direct.Id;
-            FromClientId = direct.FromPeerId;
-            SentTimestamp = direct.Timestamp;
+        internal LCIMMessage() {
         }
     }
 }
diff --git a/Realtime/Message/LCIMTypedMessage.cs b/Realtime/Message/LCIMTypedMessage.cs
index 7152dd7..fb0a61b 100644
--- a/Realtime/Message/LCIMTypedMessage.cs
+++ b/Realtime/Message/LCIMTypedMessage.cs
@@ -1,8 +1,7 @@
 using System.Collections.Generic;
 using Newtonsoft.Json;
-using LeanCloud.Realtime.Protocol;
-using LeanCloud.Storage.Internal;
 using LeanCloud.Storage.Internal.Codec;
+using LeanCloud.Storage.Internal;
 
 namespace LeanCloud.Realtime {
     public abstract class LCIMTypedMessage : LCIMMessage {
@@ -40,12 +39,6 @@ namespace LeanCloud.Realtime {
             return msgData;
         }
 
-        internal override void Decode(DirectCommand direct) {
-            base.Decode(direct);
-            Dictionary<string, object> msgData = JsonConvert.DeserializeObject<Dictionary<string, object>>(direct.Msg, new LCJsonConverter());
-            DecodeMessageData(msgData);
-        }
-
         protected virtual void DecodeMessageData(Dictionary<string, object> msgData) {
             MessageType = (int)msgData["_lctype"];
             if (msgData.TryGetValue("_lcattrs", out object attrObj)) {
@@ -53,9 +46,11 @@ namespace LeanCloud.Realtime {
             }
         }
 
-        internal static LCIMTypedMessage Deserialize(Dictionary<string, object> messageData) {
+        internal static LCIMTypedMessage Deserialize(string json) {
+            Dictionary<string, object> msgData = JsonConvert.DeserializeObject<Dictionary<string, object>>(json,
+                new LCJsonConverter());
             LCIMTypedMessage message = null;
-            int msgType = (int)messageData["_lctype"];
+            int msgType = (int)msgData["_lctype"];
             switch (msgType) {
                 case -1:
                     message = new LCIMTextMessage();
@@ -76,9 +71,11 @@ namespace LeanCloud.Realtime {
                     message = new LCIMFileMessage();
                     break;
                 default:
+                    // TODO 用户自定义类型消息
+
                     break;
             }
-            //message.Decode(direct);
+            message.DecodeMessageData(msgData);
             return message;
         }
     }
diff --git a/Test/Realtime.Test/Conversation.cs b/Test/Realtime.Test/Conversation.cs
index 102184a..5769bef 100644
--- a/Test/Realtime.Test/Conversation.cs
+++ b/Test/Realtime.Test/Conversation.cs
@@ -111,10 +111,11 @@ namespace Realtime.Test {
             string otherId = Guid.NewGuid().ToString();
             LCIMConversation conversation = await client.CreateConversation(new List<string> { otherId });
 
-            conversation.Name = "leancloud";
-            conversation["k1"] = "v1";
-            conversation["k2"] = "v2";
-            await conversation.UpdateInfo();
+            await conversation.UpdateInfo(new Dictionary<string, object> {
+                { "name", "leancloud" },
+                { "k1", "v1" },
+                { "k2", "v2" }
+            });
 
             Assert.AreEqual(conversation.Name, "leancloud");
             Assert.AreEqual(conversation["k1"], "v1");