diff --git a/Realtime/Realtime/Public/Conversation/LCIMChatRoom.cs b/Realtime/Realtime/Public/Conversation/LCIMChatRoom.cs
index 0ecccf1..6630bcd 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMChatRoom.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMChatRoom.cs
@@ -5,7 +5,7 @@ using System.Threading.Tasks;
 
 namespace LeanCloud.Realtime {
     /// <summary>
-    /// Chatroom
+    /// LCIMChatRoom is a local representation of chatroom in LeanCloud.
     /// </summary>
     public class LCIMChatRoom : LCIMConversation {
         public LCIMChatRoom(LCIMClient client) :
@@ -25,14 +25,29 @@ namespace LeanCloud.Realtime {
             return await Client.ConversationController.GetOnlineMembers(Id, limit);
         }
 
+        /// <summary>
+        /// Adds members to this conversation.
+        /// </summary>
+        /// <param name="clientIds"></param>
+        /// <returns></returns>
         public override Task<LCIMPartiallySuccessResult> AddMembers(IEnumerable<string> clientIds) {
             throw new Exception("Add members is not allowed in chat room.");
         }
 
+        /// <summary>
+        /// Flags the read status of this conversation.
+        /// But it's nothing to do in LCIMChatRoom.
+        /// </summary>
+        /// <returns></returns>
         public override Task Read() {
             return Task.CompletedTask;
         }
 
+        /// <summary>
+        /// Fetchs the recipt timestamps of this conversation.
+        /// But it's nothing to do in LCIMChatRoom.
+        /// </summary>
+        /// <returns></returns>
         public override Task FetchReciptTimestamps() {
             return Task.CompletedTask;
         }
diff --git a/Realtime/Realtime/Public/Conversation/LCIMConversation.cs b/Realtime/Realtime/Public/Conversation/LCIMConversation.cs
index ed6e75b..77cb321 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMConversation.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMConversation.cs
@@ -6,7 +6,8 @@ using System.Collections.ObjectModel;
 
 namespace LeanCloud.Realtime {
     /// <summary>
-    /// Conversation
+    /// LCIMConversation is a local representation of general conversation
+    /// in LeanCloud.
     /// </summary>
     public class LCIMConversation {
         /// <summary>
diff --git a/Realtime/Realtime/Public/Conversation/LCIMConversationMemberInfo.cs b/Realtime/Realtime/Public/Conversation/LCIMConversationMemberInfo.cs
index 48e4324..b26253e 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMConversationMemberInfo.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMConversationMemberInfo.cs
@@ -1,4 +1,7 @@
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMConversationMemberInfo represents the member info of the conversation.
+    /// </summary>
     public class LCIMConversationMemberInfo {
         public const string Owner = "Owner";
 
diff --git a/Realtime/Realtime/Public/Conversation/LCIMConversationQuery.cs b/Realtime/Realtime/Public/Conversation/LCIMConversationQuery.cs
index e65f193..a77099f 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMConversationQuery.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMConversationQuery.cs
@@ -3,10 +3,12 @@ using System.Collections;
 using System.Collections.ObjectModel;
 using LeanCloud.Storage.Internal.Query;
 using System.Linq;
-using System.Collections.Generic;
 using System;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMConversationQuery is the query for conversation.
+    /// </summary>
     public class LCIMConversationQuery {
         internal const int CompactFlag = 0x1;
         internal const int WithLastMessageFlag = 0x2;
diff --git a/Realtime/Realtime/Public/Conversation/LCIMMessageQueryOptions.cs b/Realtime/Realtime/Public/Conversation/LCIMMessageQueryOptions.cs
index c936feb..5f1aae3 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMMessageQueryOptions.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMMessageQueryOptions.cs
@@ -1,6 +1,10 @@
 using System;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMMessageQueryEndpoint is the parameter that controls the limitation
+    /// of querying messages.
+    /// </summary>
     public class LCIMMessageQueryEndpoint {
         public string MessageId {
             get; set;
diff --git a/Realtime/Realtime/Public/Conversation/LCIMServiceConversation.cs b/Realtime/Realtime/Public/Conversation/LCIMServiceConversation.cs
index d55a16f..68a0986 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMServiceConversation.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMServiceConversation.cs
@@ -2,6 +2,10 @@
 using System.Threading.Tasks;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMServiceConversation is a local representation of service conversation
+    /// in LeanCloud.
+    /// </summary>
     public class LCIMServiceConversation : LCIMConversation {
         public LCIMServiceConversation(LCIMClient client) : base(client) {
         }
diff --git a/Realtime/Realtime/Public/Conversation/LCIMTemporaryConversation.cs b/Realtime/Realtime/Public/Conversation/LCIMTemporaryConversation.cs
index 3fc19c3..698a192 100644
--- a/Realtime/Realtime/Public/Conversation/LCIMTemporaryConversation.cs
+++ b/Realtime/Realtime/Public/Conversation/LCIMTemporaryConversation.cs
@@ -1,6 +1,10 @@
 using System;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMTemporaryConversation is a local representation of temporary conversation
+    /// in LeanCloud.
+    /// </summary>
     public class LCIMTemporaryConversation : LCIMConversation {
         public DateTime ExpiredAt {
             get;
diff --git a/Realtime/Realtime/Public/LCIMClient.cs b/Realtime/Realtime/Public/LCIMClient.cs
index 88cf67a..3f64bf4 100644
--- a/Realtime/Realtime/Public/LCIMClient.cs
+++ b/Realtime/Realtime/Public/LCIMClient.cs
@@ -29,6 +29,9 @@ namespace LeanCloud.Realtime {
             get; private set;
         }
 
+        /// <summary>
+        /// Device Id
+        /// </summary>
         public string DeviceId {
             get; private set;
         }
@@ -235,6 +238,13 @@ namespace LeanCloud.Realtime {
 
         #region 接口
 
+        /// <summary>
+        /// Constructs a LCIMClient with client id.
+        /// </summary>
+        /// <param name="clientId"></param>
+        /// <param name="tag"></param>
+        /// <param name="deviceId"></param>
+        /// <param name="signatureFactory"></param>
         public LCIMClient(string clientId,
             string tag = null,
             string deviceId = null,
@@ -245,6 +255,13 @@ namespace LeanCloud.Realtime {
             SetUpClient(clientId, tag, deviceId, signatureFactory);
         }
 
+        /// <summary>
+        /// Constructs a LCIMClient with a LCUser.
+        /// </summary>
+        /// <param name="user"></param>
+        /// <param name="tag"></param>
+        /// <param name="deviceId"></param>
+        /// <param name="signatureFactory"></param>
         public LCIMClient(LCUser user,
             string tag = null,
             string deviceId = null,
diff --git a/Realtime/Realtime/Public/LCRealtime.cs b/Realtime/Realtime/Public/LCRealtime.cs
index 08d7c19..9b70960 100644
--- a/Realtime/Realtime/Public/LCRealtime.cs
+++ b/Realtime/Realtime/Public/LCRealtime.cs
@@ -2,6 +2,9 @@
 using LeanCloud.Realtime.Internal.Connection;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCRealtime contains static functions that handle the global connection.
+    /// </summary>
     public class LCRealtime {
         /// <summary>
         /// Every application uses a connection.
diff --git a/Realtime/Realtime/Public/Message/LCIMAudioMessage.cs b/Realtime/Realtime/Public/Message/LCIMAudioMessage.cs
index cf80bec..f7103a5 100644
--- a/Realtime/Realtime/Public/Message/LCIMAudioMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMAudioMessage.cs
@@ -2,6 +2,9 @@
 using LeanCloud.Storage;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMAudioMessage is a local representation of audio message in LeanCloud.
+    /// </summary>
     public class LCIMAudioMessage : LCIMFileMessage {
         public double Duration {
             get; private set;
diff --git a/Realtime/Realtime/Public/Message/LCIMBinaryMessage.cs b/Realtime/Realtime/Public/Message/LCIMBinaryMessage.cs
index d0af326..f5d5aa2 100644
--- a/Realtime/Realtime/Public/Message/LCIMBinaryMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMBinaryMessage.cs
@@ -1,4 +1,7 @@
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMBinaryMessage is a local representation of binary message in LeanCloud.
+    /// </summary>
     public class LCIMBinaryMessage : LCIMMessage {
         public byte[] Data {
             get; internal set;
diff --git a/Realtime/Realtime/Public/Message/LCIMFileMessage.cs b/Realtime/Realtime/Public/Message/LCIMFileMessage.cs
index 1c8656c..d5fc485 100644
--- a/Realtime/Realtime/Public/Message/LCIMFileMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMFileMessage.cs
@@ -5,6 +5,9 @@ using LeanCloud.Storage;
 using System.Threading.Tasks;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMFileMessage is a local representation of file message in LeanCloud.
+    /// </summary>
     public class LCIMFileMessage : LCIMTextMessage {
         public LCFile File {
             get; set;
diff --git a/Realtime/Realtime/Public/Message/LCIMImageMessage.cs b/Realtime/Realtime/Public/Message/LCIMImageMessage.cs
index 07679ed..5fd2a97 100644
--- a/Realtime/Realtime/Public/Message/LCIMImageMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMImageMessage.cs
@@ -2,6 +2,9 @@
 using LeanCloud.Storage;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMImageMessage is a local representation of image message in LeanCloud.
+    /// </summary>
     public class LCIMImageMessage : LCIMFileMessage {
         public int Width {
             get; private set;
diff --git a/Realtime/Realtime/Public/Message/LCIMLocationMessage.cs b/Realtime/Realtime/Public/Message/LCIMLocationMessage.cs
index 44fde3b..6ebf596 100644
--- a/Realtime/Realtime/Public/Message/LCIMLocationMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMLocationMessage.cs
@@ -3,6 +3,9 @@ using System.Collections.Generic;
 using LeanCloud.Storage;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMLocationMessage is a local representation of location message in LeanCloud.
+    /// </summary>
     public class LCIMLocationMessage : LCIMTextMessage {
         public LCGeoPoint Location {
             get; set;
diff --git a/Realtime/Realtime/Public/Message/LCIMTextMessage.cs b/Realtime/Realtime/Public/Message/LCIMTextMessage.cs
index e9cee7b..5c834fa 100644
--- a/Realtime/Realtime/Public/Message/LCIMTextMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMTextMessage.cs
@@ -1,6 +1,9 @@
 using System.Collections.Generic;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMTextMessage is a local representation of text message in LeanCloud.
+    /// </summary>
     public class LCIMTextMessage : LCIMTypedMessage {
         public string Text {
             get; set;
diff --git a/Realtime/Realtime/Public/Message/LCIMVideoMessage.cs b/Realtime/Realtime/Public/Message/LCIMVideoMessage.cs
index c49ce9f..0fe119a 100644
--- a/Realtime/Realtime/Public/Message/LCIMVideoMessage.cs
+++ b/Realtime/Realtime/Public/Message/LCIMVideoMessage.cs
@@ -2,6 +2,9 @@
 using LeanCloud.Storage;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMVideoMessage is a local representation of video message in LeanCloud.
+    /// </summary>
     public class LCIMVideoMessage : LCIMFileMessage {
         public int Width {
             get; private set;
diff --git a/Realtime/Realtime/Public/Result/LCIMOperationFailure.cs b/Realtime/Realtime/Public/Result/LCIMOperationFailure.cs
index 1f95229..e282a12 100644
--- a/Realtime/Realtime/Public/Result/LCIMOperationFailure.cs
+++ b/Realtime/Realtime/Public/Result/LCIMOperationFailure.cs
@@ -1,6 +1,9 @@
 using System.Collections.Generic;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMOperationFailure is the result that handles the operation of conversation.
+    /// </summary>
     public class LCIMOperationFailure {
         public int Code {
             get; set;
diff --git a/Realtime/Realtime/Public/Result/LCIMPageResult.cs b/Realtime/Realtime/Public/Result/LCIMPageResult.cs
index a559db6..259dfb9 100644
--- a/Realtime/Realtime/Public/Result/LCIMPageResult.cs
+++ b/Realtime/Realtime/Public/Result/LCIMPageResult.cs
@@ -1,6 +1,9 @@
 using System.Collections.ObjectModel;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMPageResult represents the results of query.
+    /// </summary>
     public class LCIMPageResult {
         public ReadOnlyCollection<string> Results {
             get; internal set;
diff --git a/Realtime/Realtime/Public/Result/LCIMPartiallySuccessResult.cs b/Realtime/Realtime/Public/Result/LCIMPartiallySuccessResult.cs
index 86f61e5..92e008a 100644
--- a/Realtime/Realtime/Public/Result/LCIMPartiallySuccessResult.cs
+++ b/Realtime/Realtime/Public/Result/LCIMPartiallySuccessResult.cs
@@ -1,6 +1,9 @@
 using System.Collections.Generic;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMPartiallySuccessResult is the result that handles the operation of conversation.
+    /// </summary>
     public class LCIMPartiallySuccessResult {
         public List<string> SuccessfulClientIdList {
             get; internal set;
diff --git a/Realtime/Realtime/Public/Signature/ILCIMSignatureFactory.cs b/Realtime/Realtime/Public/Signature/ILCIMSignatureFactory.cs
index 47efa91..7cd9fc6 100644
--- a/Realtime/Realtime/Public/Signature/ILCIMSignatureFactory.cs
+++ b/Realtime/Realtime/Public/Signature/ILCIMSignatureFactory.cs
@@ -2,6 +2,9 @@
 using System.Threading.Tasks;
 
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// 
+    /// </summary>
     public interface ILCIMSignatureFactory {
         Task<LCIMSignature> CreateConnectSignature(string clientId);
 
diff --git a/Realtime/Realtime/Public/Signature/LCIMSignature.cs b/Realtime/Realtime/Public/Signature/LCIMSignature.cs
index 416b86d..1207f52 100644
--- a/Realtime/Realtime/Public/Signature/LCIMSignature.cs
+++ b/Realtime/Realtime/Public/Signature/LCIMSignature.cs
@@ -1,4 +1,7 @@
 namespace LeanCloud.Realtime {
+    /// <summary>
+    /// LCIMSignature represents a LCRealtime signature.
+    /// </summary>
     public class LCIMSignature {
         public string Signature {
             get; set;