diff --git a/Storage/Storage.Test/UserTest.cs b/Storage/Storage.Test/UserTest.cs
index f839c47..024b93b 100644
--- a/Storage/Storage.Test/UserTest.cs
+++ b/Storage/Storage.Test/UserTest.cs
@@ -35,7 +35,7 @@ namespace LeanCloudTests {
 
         [Test]
         public async Task LoginWithEmail() {
-            AVUser user = await AVUser.LogInByEmailAsync("111111@qq.com", "111111");
+            AVUser user = await AVUser.LogInWithEmailAsync("111111@qq.com", "111111");
             Assert.AreEqual(user, AVUser.CurrentUser);
             TestContext.Out.WriteLine($"{AVUser.CurrentUser.SessionToken} login");
         }
@@ -49,7 +49,7 @@ namespace LeanCloudTests {
 
         [Test]
         public async Task IsAuthenticated() {
-            AVUser user = await AVUser.LogInByEmailAsync("111111@qq.com", "111111");
+            AVUser user = await AVUser.LogInWithEmailAsync("111111@qq.com", "111111");
             Assert.IsTrue(user.IsCurrent);
             Assert.AreEqual(user, AVUser.CurrentUser);
             bool authenticated = await user.IsAuthenticatedAsync();
@@ -58,7 +58,7 @@ namespace LeanCloudTests {
 
         [Test]
         public async Task RefreshSessionToken() {
-            AVUser user = await AVUser.LogInByEmailAsync("111111@qq.com", "111111");
+            AVUser user = await AVUser.LogInWithEmailAsync("111111@qq.com", "111111");
             Assert.IsTrue(user.IsCurrent);
             await user.RefreshSessionTokenAsync();
             TestContext.Out.WriteLine(user.SessionToken);
diff --git a/Storage/Storage/Internal/Authentication/IAVAuthenticationProvider.cs b/Storage/Storage/Internal/Authentication/IAVAuthenticationProvider.cs
deleted file mode 100644
index 406e37c..0000000
--- a/Storage/Storage/Internal/Authentication/IAVAuthenticationProvider.cs
+++ /dev/null
@@ -1,36 +0,0 @@
-using System.Collections.Generic;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace LeanCloud.Storage.Internal {
-  public interface IAVAuthenticationProvider {
-    /// <summary>
-    /// Authenticates with the service.
-    /// </summary>
-    /// <param name="cancellationToken">The cancellation token.</param>
-    Task<IDictionary<string, object>> AuthenticateAsync(CancellationToken cancellationToken);
-
-    /// <summary>
-    /// Deauthenticates (logs out) the user associated with this provider. This
-    /// call may block.
-    /// </summary>
-    void Deauthenticate();
-
-    /// <summary>
-    /// Restores authentication that has been serialized, such as session keys,
-    /// etc.
-    /// </summary>
-    /// <param name="authData">The auth data for the provider. This value may be null
-    /// when unlinking an account.</param>
-    /// <returns><c>true</c> iff the authData was successfully synchronized. A <c>false</c> return
-    /// value indicates that the user should no longer be associated because of bad auth
-    /// data.</returns>
-    bool RestoreAuthentication(IDictionary<string, object> authData);
-
-    /// <summary>
-    /// Provides a unique name for the type of authentication the provider does.
-    /// For example, the FacebookAuthenticationProvider would return "facebook".
-    /// </summary>
-    string AuthType { get; }
-  }
-}
diff --git a/Storage/Storage/Public/AVUser.cs b/Storage/Storage/Public/AVUser.cs
index 7a7f910..465397f 100644
--- a/Storage/Storage/Public/AVUser.cs
+++ b/Storage/Storage/Public/AVUser.cs
@@ -11,9 +11,6 @@ namespace LeanCloud {
     /// </summary>
     [AVClassName("_User")]
     public class AVUser : AVObject {
-        private static readonly IDictionary<string, IAVAuthenticationProvider> authProviders =
-            new Dictionary<string, IAVAuthenticationProvider>();
-
         internal static AVUserController UserController {
             get {
                 return AVPlugins.Instance.UserController;
@@ -21,52 +18,22 @@ namespace LeanCloud {
         }
 
         /// <summary>
-        /// 判断是否是当前用户
+        /// 获取当前用户
         /// </summary>
-        public bool IsCurrent {
+        public static AVUser CurrentUser {
+            get;
+            internal set;
+        }
+
+        /// <summary>
+        /// 创建一个 AVUser 查询对象
+        /// </summary>
+        public static AVQuery<AVUser> Query {
             get {
-                return CurrentUser == this;
+                return new AVQuery<AVUser>();
             }
         }
 
-        /// <summary>
-        /// 判断当前用户的 Session Token 是否有效
-        /// </summary>
-        /// <returns></returns>
-        public async Task<bool> IsAuthenticatedAsync() {
-            lock (mutex) {
-                if (SessionToken == null || CurrentUser == null || CurrentUser.ObjectId != ObjectId) {
-                    return false;
-                }
-            }
-            var command = new AVCommand {
-                Path = $"users/me?session_token={SessionToken}",
-                Method = HttpMethod.Get
-            };
-            await AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
-            return true;
-        }
-
-        /// <summary>
-        /// 刷新用户的 Session Token，刷新后 Session Token 将会改变
-        /// </summary>
-        /// <returns></returns>
-        public async Task RefreshSessionTokenAsync() {
-            var serverState = await UserController.RefreshSessionTokenAsync(ObjectId);
-            HandleSave(serverState);
-        }
-
-        /// <summary>
-        /// 获取 Session Token
-        /// </summary>
-        public string SessionToken {
-            get {
-                if (State.ContainsKey("sessionToken")) {
-                    return State["sessionToken"] as string;
-                }
-                return null;
-            }
-        }
 
         /// <summary>
         /// 用户名
@@ -134,6 +101,33 @@ namespace LeanCloud {
             }
         }
 
+        /// <summary>
+        /// 获取 Session Token
+        /// </summary>
+        public string SessionToken {
+            get {
+                if (State.ContainsKey("sessionToken")) {
+                    return State["sessionToken"] as string;
+                }
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// 用户数据
+        /// </summary>
+        internal IDictionary<string, IDictionary<string, object>> AuthData {
+            get {
+                if (TryGetValue("authData", out IDictionary<string, IDictionary<string, object>> authData)) {
+                    return authData;
+                }
+                return null;
+            }
+            private set {
+                this["authData"] = value;
+            }
+        }
+
         /// <summary>
         /// 判断用户是否为匿名用户
         /// </summary>
@@ -143,6 +137,44 @@ namespace LeanCloud {
             }
         }
 
+        /// <summary>
+        /// 判断是否是当前用户
+        /// </summary>
+        public bool IsCurrent {
+            get {
+                return CurrentUser == this;
+            }
+        }
+
+        /// <summary>
+        /// 判断当前用户的 Session Token 是否有效
+        /// </summary>
+        /// <returns></returns>
+        public async Task<bool> IsAuthenticatedAsync() {
+            lock (mutex) {
+                if (SessionToken == null || CurrentUser == null || CurrentUser.ObjectId != ObjectId) {
+                    return false;
+                }
+            }
+            var command = new AVCommand {
+                Path = $"users/me?session_token={SessionToken}",
+                Method = HttpMethod.Get
+            };
+            await AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
+            return true;
+        }
+
+        /// <summary>
+        /// 刷新用户的 Session Token，刷新后 Session Token 将会改变
+        /// </summary>
+        /// <returns></returns>
+        public async Task RefreshSessionTokenAsync() {
+            var serverState = await UserController.RefreshSessionTokenAsync(ObjectId);
+            HandleSave(serverState);
+        }
+
+        #region 账号密码登陆
+
         /// <summary>
         /// 注册新用户，注册成功后将保存为当前用户。必须设置用户名和密码。
         /// </summary>
@@ -170,99 +202,6 @@ namespace LeanCloud {
             }
         }
 
-        #region 事件流系统相关 API
-
-        /// <summary>
-        /// 关注某个用户
-        /// </summary>
-        /// <param name="userObjectId">被关注的用户</param>
-        /// <returns></returns>
-        public Task FollowAsync(string userObjectId) {
-            return FollowAsync(userObjectId, null);
-        }
-
-        /// <summary>
-        /// 关注某个用户
-        /// </summary>
-        /// <param name="userObjectId">被关注的用户Id</param>
-        /// <param name="data">关注的时候附加属性</param>
-        /// <returns></returns>
-        public Task FollowAsync(string userObjectId, IDictionary<string, object> data) {
-            if (data != null) {
-                data = EncodeForSaving(data);
-            }
-            var command = new AVCommand {
-                Path = $"users/{ObjectId}/friendship/{userObjectId}",
-                Method = HttpMethod.Post,
-                Content = data
-            };
-            return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
-        }
-
-        /// <summary>
-        /// 取关某一个用户
-        /// </summary>
-        /// <param name="userObjectId"></param>
-        /// <returns></returns>
-        public Task UnfollowAsync(string userObjectId) {
-            var command = new AVCommand {
-                Path = $"users/{ObjectId}/friendship/{userObjectId}",
-                Method = HttpMethod.Delete
-            };
-            return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
-        }
-
-        /// <summary>
-        /// 获取当前用户的关注者的查询
-        /// </summary>
-        /// <returns></returns>
-        public AVQuery<AVUser> GetFollowerQuery() {
-            AVQuery<AVUser> query = new AVQuery<AVUser> {
-                Path = $"users/{ObjectId}/followers"
-            };
-            return query;
-        }
-
-        /// <summary>
-        /// 获取当前用户所关注的用户的查询
-        /// </summary>
-        /// <returns></returns>
-        public AVQuery<AVUser> GetFolloweeQuery() {
-            AVQuery<AVUser> query = new AVQuery<AVUser> {
-                Path = $"users/{ObjectId}/followees"
-            };
-            return query;
-        }
-
-        /// <summary>
-        /// 同时查询关注了当前用户的关注者和当前用户所关注的用户
-        /// </summary>
-        /// <returns></returns>
-        public AVQuery<AVUser> GetFollowersAndFolloweesQuery() {
-            AVQuery<AVUser> query = new AVQuery<AVUser> {
-                Path = $"users/{ObjectId}/followersAndFollowees"
-            };
-            return query;
-        }
-
-        /// <summary>
-        /// 获取当前用户的关注者
-        /// </summary>
-        /// <returns></returns>
-        public Task<IEnumerable<AVUser>> GetFollowersAsync() {
-            return GetFollowerQuery().FindAsync(CancellationToken.None);
-        }
-
-        /// <summary>
-        /// 获取当前用户所关注的用户
-        /// </summary>
-        /// <returns></returns>
-        public Task<IEnumerable<AVUser>> GetFolloweesAsync() {
-            return GetFolloweeQuery().FindAsync(CancellationToken.None);
-        }
-
-        #endregion
-
         /// <summary>
         /// 使用用户名和密码登陆。登陆成功后，将用户设置为当前用户
         /// </summary>
@@ -277,45 +216,16 @@ namespace LeanCloud {
         }
 
         /// <summary>
-        /// 使用 Session Token 登录。
+        /// 用邮箱作和密码匹配登录
         /// </summary>
-        /// <param name="sessionToken">Session Token</param>
+        /// <param name="email">邮箱</param>
+        /// <param name="password">密码</param>
         /// <returns></returns>
-        public static async Task<AVUser> BecomeAsync(string sessionToken) {
-            var ret = await UserController.GetUserAsync(sessionToken);
+        public static async Task<AVUser> LogInWithEmailAsync(string email, string password) {
+            var ret = await UserController.LogInAsync(null, email, password);
             AVUser user = FromState<AVUser>(ret, "_User");
             CurrentUser = user;
-            return user;
-        }
-
-        /// <summary>
-        /// 用户登出
-        /// </summary>
-        public static void LogOut() {
-            CurrentUser = null;
-        }
-
-        private static void LogOutWithProviders() {
-            foreach (var provider in authProviders.Values) {
-                provider.Deauthenticate();
-            }
-        }
-
-        /// <summary>
-        /// 获取当前用户
-        /// </summary>
-        public static AVUser CurrentUser {
-            get;
-            internal set;
-        }
-
-        /// <summary>
-        /// 创建一个 AVUser 查询对象
-        /// </summary>
-        public static AVQuery<AVUser> Query {
-            get {
-                return new AVQuery<AVUser>();
-            }
+            return CurrentUser;
         }
 
         /// <summary>
@@ -339,83 +249,99 @@ namespace LeanCloud {
         }
 
         /// <summary>
-        /// 用户数据
+        /// 申请发送验证邮箱的邮件，一周之内有效
+        /// 如果该邮箱已经验证通过，会直接返回 True，并不会真正发送邮件
+        /// 注意，不能频繁的调用此接口，一天之内只允许向同一个邮箱发送验证邮件 3 次，超过调用次数，会直接返回错误
         /// </summary>
-        internal IDictionary<string, IDictionary<string, object>> AuthData {
-            get {
-                if (TryGetValue("authData", out IDictionary<string, IDictionary<string, object>> authData)) {
-                    return authData;
-                }
-                return null;
-            }
-            private set {
-                this["authData"] = value;
-            }
+        /// <param name="email">邮箱地址</param>
+        /// <returns></returns>
+        public static Task RequestEmailVerifyAsync(string email) {
+            Dictionary<string, object> strs = new Dictionary<string, object> {
+                { "email", email }
+            };
+            var command = new AVCommand {
+                Path = "requestEmailVerify",
+                Method = HttpMethod.Post,
+                Content = strs
+            };
+            return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
         }
 
-        private static IAVAuthenticationProvider GetProvider(string providerName) {
-            if (authProviders.TryGetValue(providerName, out IAVAuthenticationProvider provider)) {
-                return provider;
+        #endregion
+
+
+        #region 第三方登录
+
+        /// <summary>
+        /// 使用第三方数据注册；如果已经存在相同的 Auth Data，则执行登录
+        /// </summary>
+        /// <param name="authData">Auth Data</param>
+        /// <param name="platform">平台</param>
+        /// <param name="options"></param>
+        /// <returns></returns>
+        public static Task<AVUser> LogInWithAuthDataAsync(IDictionary<string, object> authData, string platform, AVUserAuthDataLogInOption options = null) {
+            if (options == null) {
+                options = new AVUserAuthDataLogInOption();
             }
-            return null;
+            return LogInWithAsync(platform, authData, options.FailOnNotExist);
         }
 
         /// <summary>
-        /// Removes null values from authData (which exist temporarily for unlinking)
+        /// 使用第三方数据注册；
         /// </summary>
-        private void CleanupAuthData() {
-            lock (mutex) {
-                if (!IsCurrent) {
-                    return;
-                }
-                var authData = AuthData;
-
-                if (authData == null) {
-                    return;
-                }
-
-                foreach (var pair in new Dictionary<string, IDictionary<string, object>>(authData)) {
-                    if (pair.Value == null) {
-                        authData.Remove(pair.Key);
-                    }
-                }
+        /// <param name="authData">Auth data</param>
+        /// <param name="platform">平台标识</param>
+        /// <param name="unionId"></param>
+        /// <param name="options"></param>
+        /// <returns></returns>
+        public static Task<AVUser> LogInWithAuthDataAndUnionIdAsync(IDictionary<string, object> authData, string platform, string unionId,
+            AVUserAuthDataLogInOption options = null) {
+            if (options == null) {
+                options = new AVUserAuthDataLogInOption();
             }
+            MergeAuthData(authData, unionId, options);
+            return LogInWithAsync(platform, authData, options.FailOnNotExist);
         }
 
         /// <summary>
-        /// Synchronizes authData for all providers.
+        /// 绑定第三方登录
         /// </summary>
-        private void SynchronizeAllAuthData() {
-            lock (mutex) {
-                var authData = AuthData;
-
-                if (authData == null) {
-                    return;
-                }
-
-                foreach (var pair in authData) {
-                    SynchronizeAuthData(GetProvider(pair.Key));
-                }
-            }
+        /// <param name="authData">Auth data</param>
+        /// <param name="platform">平台标识</param>
+        /// <returns></returns>
+        public Task AssociateAuthDataAsync(IDictionary<string, object> authData, string platform) {
+            return LinkWithAsync(platform, authData);
         }
 
-        private void SynchronizeAuthData(IAVAuthenticationProvider provider) {
-            bool restorationSuccess = false;
-            lock (mutex) {
-                var authData = AuthData;
-                if (authData == null || provider == null) {
-                    return;
-                }
-                if (authData.TryGetValue(provider.AuthType, out IDictionary<string, object> data)) {
-                    restorationSuccess = provider.RestoreAuthentication(data);
-                }
-            }
-
-            if (!restorationSuccess) {
-                UnlinkFromAsync(provider.AuthType, CancellationToken.None);
+        /// <summary>
+        /// 绑定第三方登录
+        /// </summary>
+        /// <param name="authData">OAuth data</param>
+        /// <param name="platform">平台标识</param>
+        /// <param name="unionId"></param>
+        /// <param name="options"></param>
+        /// <returns></returns>
+        public Task AssociateAuthDataAndUnionIdAsync(IDictionary<string, object> authData, string platform, string unionId,
+            AVUserAuthDataLogInOption options = null) {
+            if (options == null) {
+                options = new AVUserAuthDataLogInOption();
             }
+            MergeAuthData(authData, unionId, options);
+            return LinkWithAsync(platform, authData);
         }
 
+        /// <summary>
+        /// 解绑第三方登录
+        /// </summary>
+        /// <param name="platform">平台标识</param>
+        /// <returns></returns>
+        public Task DisassociateWithAuthDataAsync(string platform) {
+            return LinkWithAsync(platform, null);
+        }
+
+        #endregion
+
+
         public Task LinkWithAsync(string authType, IDictionary<string, object> data) {
             AuthData = new Dictionary<string, IDictionary<string, object>> {
                 [authType] = data
@@ -423,85 +349,25 @@ namespace LeanCloud {
             return SaveAsync();
         }
 
-        public Task LinkWithAsync(string authType, CancellationToken cancellationToken) {
-            var provider = GetProvider(authType);
-            return provider.AuthenticateAsync(cancellationToken)
-              .OnSuccess(t => LinkWithAsync(authType, t.Result))
-              .Unwrap();
-        }
-
-        /// <summary>
-        /// Unlinks a user from a service.
-        /// </summary>
-        public Task UnlinkFromAsync(string authType, CancellationToken cancellationToken) {
-            return LinkWithAsync(authType, null);
-        }
-
-        /// <summary>
-        /// Checks whether a user is linked to a service.
-        /// </summary>
-        internal bool IsLinked(string authType) {
-            lock (mutex) {
-                return AuthData != null && AuthData.ContainsKey(authType) && AuthData[authType] != null;
-            }
-        }
-
         internal static async Task<AVUser> LogInWithAsync(string authType, IDictionary<string, object> data, bool failOnNotExist) {
             var ret = await UserController.LogInAsync(authType, data, failOnNotExist);
             AVUser user = FromState<AVUser>(ret, "_User");
-            user.AuthData = new Dictionary<string, IDictionary<string, object>>();
-            user.AuthData[authType] = data;
-            user.SynchronizeAllAuthData();
+            user.AuthData = new Dictionary<string, IDictionary<string, object>> {
+                [authType] = data
+            };
             CurrentUser = user;
             return CurrentUser;
         }
 
-        internal static Task<AVUser> LogInWithAsync(string authType) {
-            var provider = GetProvider(authType);
-            return provider.AuthenticateAsync(CancellationToken.None)
-              .OnSuccess(authData => LogInWithAsync(authType, authData.Result, false))
-              .Unwrap();
-        }
-
-        internal static void RegisterProvider(IAVAuthenticationProvider provider) {
-            authProviders[provider.AuthType] = provider;
-            var curUser = CurrentUser;
-            if (curUser != null) {
-                curUser.SynchronizeAuthData(provider);
-            }
-        }
-
         #region 手机号登录
 
-        internal static async Task<AVUser> LogInWithParametersAsync(Dictionary<string, object> strs) {
-            IObjectState ret = await UserController.LogInWithParametersAsync("login", strs);
-            AVUser user = CreateWithoutData<AVUser>(null);
-            user.HandleFetchResult(ret);
-            CurrentUser = user;
-            return CurrentUser;
-        }
-
-        /// <summary>
-        /// 用邮箱作和密码匹配登录
-        /// </summary>
-        /// <param name="email">邮箱</param>
-        /// <param name="password">密码</param>
-        /// <returns></returns>
-        public static async Task<AVUser> LogInByEmailAsync(string email, string password) {
-            var ret = await UserController.LogInAsync(null, email, password);
-            AVUser user = FromState<AVUser>(ret, "_User");
-            CurrentUser = user;
-            return CurrentUser;
-        }
-
-
         /// <summary>
         /// 用手机号和密码匹配登陆
         /// </summary>
         /// <param name="mobilePhoneNumber">手机号</param>
         /// <param name="password">密码</param>
         /// <returns></returns>
-        public static Task<AVUser> LogInByMobilePhoneNumberAsync(string mobilePhoneNumber, string password) {
+        public static Task<AVUser> LogInWithMobilePhoneNumberAsync(string mobilePhoneNumber, string password) {
             Dictionary<string, object> strs = new Dictionary<string, object> {
                 { "mobilePhoneNumber", mobilePhoneNumber },
                 { "password", password }
@@ -515,7 +381,7 @@ namespace LeanCloud {
         /// <param name="mobilePhoneNumber">手机号</param>
         /// <param name="smsCode">短信验证码</param>
         /// <returns></returns>
-        public static Task<AVUser> LogInByMobilePhoneNumberSmsCodeAsync(string mobilePhoneNumber, string smsCode) {
+        public static Task<AVUser> LogInWithMobilePhoneNumberSmsCodeAsync(string mobilePhoneNumber, string smsCode) {
             Dictionary<string, object> strs = new Dictionary<string, object> {
                 { "mobilePhoneNumber", mobilePhoneNumber },
                 { "smsCode", smsCode }
@@ -641,60 +507,10 @@ namespace LeanCloud {
 
         #endregion
 
-        #region 邮箱验证
-
         /// <summary>
-        /// 申请发送验证邮箱的邮件，一周之内有效
-        /// 如果该邮箱已经验证通过，会直接返回 True，并不会真正发送邮件
-        /// 注意，不能频繁的调用此接口，一天之内只允许向同一个邮箱发送验证邮件 3 次，超过调用次数，会直接返回错误
+        /// 匿名登录
         /// </summary>
-        /// <param name="email">邮箱地址</param>
         /// <returns></returns>
-        public static Task RequestEmailVerifyAsync(string email) {
-            Dictionary<string, object> strs = new Dictionary<string, object> {
-                { "email", email }
-            };
-            var command = new AVCommand {
-                Path = "requestEmailVerify",
-                Method = HttpMethod.Post,
-                Content = strs
-            };
-            return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
-        }
-
-        #endregion
-
-        #region AVUser Extension
-
-        public IDictionary<string, IDictionary<string, object>> GetAuthData() {
-            return AuthData;
-        }
-
-        /// <summary>
-        /// use 3rd auth data to sign up or log in.if user with the same auth data exits,it will transfer as log in.
-        /// </summary>
-        /// <param name="data">OAuth data, like {"accessToken":"xxxxxx"}</param>
-        /// <param name="platform">auth platform,maybe "facebook"/"twiiter"/"weibo"/"weixin" .etc</param>
-        /// <returns></returns>
-        public static Task<AVUser> LogInWithAuthDataAsync(IDictionary<string, object> data, string platform, AVUserAuthDataLogInOption options = null) {
-            if (options == null) {
-                options = new AVUserAuthDataLogInOption();
-            }
-            return LogInWithAsync(platform, data, options.FailOnNotExist);
-        }
-
-        public static Task<AVUser> LogInWithAuthDataAndUnionIdAsync(
-            IDictionary<string, object> authData,
-            string platform,
-            string unionId,
-            AVUserAuthDataLogInOption options = null) {
-            if (options == null) {
-                options = new AVUserAuthDataLogInOption();
-            }
-            MergeAuthData(authData, unionId, options);
-            return LogInWithAsync(platform, authData, options.FailOnNotExist);
-        }
-
         public static Task<AVUser> LogInAnonymouslyAsync() {
             var data = new Dictionary<string, object> {
                 { "id", Guid.NewGuid().ToString() }
@@ -704,35 +520,124 @@ namespace LeanCloud {
         }
 
         /// <summary>
-        /// link a 3rd auth account to the user.
+        /// 使用 Session Token 登录。
         /// </summary>
-        /// <param name="data">OAuth data, like {"accessToken":"xxxxxx"}</param>
-        /// <param name="platform">auth platform,maybe "facebook"/"twiiter"/"weibo"/"weixin" .etc</param>
+        /// <param name="sessionToken">Session Token</param>
         /// <returns></returns>
-        public Task AssociateAuthDataAsync(IDictionary<string, object> data, string platform) {
-            return LinkWithAsync(platform, data);
-        }
-
-        public Task AssociateAuthDataAndUnionIdAsync(
-            IDictionary<string, object> authData,
-            string platform,
-            string unionId,
-            AVUserAuthDataLogInOption options = null) {
-            if (options == null) {
-                options = new AVUserAuthDataLogInOption();
-            }
-            MergeAuthData(authData, unionId, options);
-            return LinkWithAsync(platform, authData);
+        public static async Task<AVUser> BecomeAsync(string sessionToken) {
+            var ret = await UserController.GetUserAsync(sessionToken);
+            AVUser user = FromState<AVUser>(ret, "_User");
+            CurrentUser = user;
+            return user;
         }
 
         /// <summary>
-        /// unlink a 3rd auth account from the user.
+        /// 用户登出
         /// </summary>
-        /// <param name="platform">auth platform,maybe "facebook"/"twiiter"/"weibo"/"weixin" .etc</param>
-        /// <param name="cancellationToken"></param>
+        public static void LogOut() {
+            CurrentUser = null;
+        }
+
+        #region 事件流系统相关 API
+
+        /// <summary>
+        /// 关注某个用户
+        /// </summary>
+        /// <param name="userObjectId">被关注的用户</param>
         /// <returns></returns>
-        public Task DisassociateWithAuthDataAsync(string platform, CancellationToken cancellationToken = default(System.Threading.CancellationToken)) {
-            return UnlinkFromAsync(platform, cancellationToken);
+        public Task FollowAsync(string userObjectId) {
+            return FollowAsync(userObjectId, null);
+        }
+
+        /// <summary>
+        /// 关注某个用户
+        /// </summary>
+        /// <param name="userObjectId">被关注的用户Id</param>
+        /// <param name="data">关注的时候附加属性</param>
+        /// <returns></returns>
+        public Task FollowAsync(string userObjectId, IDictionary<string, object> data) {
+            if (data != null) {
+                data = EncodeForSaving(data);
+            }
+            var command = new AVCommand {
+                Path = $"users/{ObjectId}/friendship/{userObjectId}",
+                Method = HttpMethod.Post,
+                Content = data
+            };
+            return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
+        }
+
+        /// <summary>
+        /// 取关某一个用户
+        /// </summary>
+        /// <param name="userObjectId"></param>
+        /// <returns></returns>
+        public Task UnfollowAsync(string userObjectId) {
+            var command = new AVCommand {
+                Path = $"users/{ObjectId}/friendship/{userObjectId}",
+                Method = HttpMethod.Delete
+            };
+            return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command);
+        }
+
+        /// <summary>
+        /// 获取当前用户的关注者的查询
+        /// </summary>
+        /// <returns></returns>
+        public AVQuery<AVUser> GetFollowerQuery() {
+            AVQuery<AVUser> query = new AVQuery<AVUser> {
+                Path = $"users/{ObjectId}/followers"
+            };
+            return query;
+        }
+
+        /// <summary>
+        /// 获取当前用户所关注的用户的查询
+        /// </summary>
+        /// <returns></returns>
+        public AVQuery<AVUser> GetFolloweeQuery() {
+            AVQuery<AVUser> query = new AVQuery<AVUser> {
+                Path = $"users/{ObjectId}/followees"
+            };
+            return query;
+        }
+
+        /// <summary>
+        /// 同时查询关注了当前用户的关注者和当前用户所关注的用户
+        /// </summary>
+        /// <returns></returns>
+        public AVQuery<AVUser> GetFollowersAndFolloweesQuery() {
+            AVQuery<AVUser> query = new AVQuery<AVUser> {
+                Path = $"users/{ObjectId}/followersAndFollowees"
+            };
+            return query;
+        }
+
+        /// <summary>
+        /// 获取当前用户的关注者
+        /// </summary>
+        /// <returns></returns>
+        public Task<IEnumerable<AVUser>> GetFollowersAsync() {
+            return GetFollowerQuery().FindAsync(CancellationToken.None);
+        }
+
+        /// <summary>
+        /// 获取当前用户所关注的用户
+        /// </summary>
+        /// <returns></returns>
+        public Task<IEnumerable<AVUser>> GetFolloweesAsync() {
+            return GetFolloweeQuery().FindAsync(CancellationToken.None);
+        }
+
+        #endregion
+
+
+        internal static async Task<AVUser> LogInWithParametersAsync(Dictionary<string, object> strs) {
+            IObjectState ret = await UserController.LogInWithParametersAsync("login", strs);
+            AVUser user = CreateWithoutData<AVUser>(null);
+            user.HandleFetchResult(ret);
+            CurrentUser = user;
+            return CurrentUser;
         }
 
         /// 合并为支持 AuthData 的格式
@@ -741,7 +646,5 @@ namespace LeanCloud {
             authData["main_account"] = options.AsMainAccount;
             authData["unionid"] = unionId;
         }
-
-        #endregion
     }
 }