diff --git a/AgileConfig.Server.Apisite/Controllers/AdminController.cs b/AgileConfig.Server.Apisite/Controllers/AdminController.cs
index 7d3b1f32..39b770fd 100644
--- a/AgileConfig.Server.Apisite/Controllers/AdminController.cs
+++ b/AgileConfig.Server.Apisite/Controllers/AdminController.cs
@@ -11,6 +11,7 @@
 using System.Dynamic;
 using AgileConfig.Server.Apisite.Utilites;
 using AgileConfig.Server.OIDC;
+using System.Collections.Generic;
 
 namespace AgileConfig.Server.Apisite.Controllers
 {
@@ -131,6 +132,7 @@ public async Task<IActionResult> OidcLoginByCode(string code)
                     Source = UserSource.SSO
                 };
                 await _userService.AddAsync(newUser);
+                await _userService.UpdateUserRolesAsync(newUser.Id, new List<Role> { Role.NormalUser });
             }
 
             var response = await LoginSuccessful(userInfo.UserName);
diff --git a/AgileConfig.Server.Apisite/Controllers/UserController.cs b/AgileConfig.Server.Apisite/Controllers/UserController.cs
index 7c991659..39a5129a 100644
--- a/AgileConfig.Server.Apisite/Controllers/UserController.cs
+++ b/AgileConfig.Server.Apisite/Controllers/UserController.cs
@@ -111,10 +111,10 @@ public async Task<IActionResult> Add([FromBody] UserVM model)
             user.CreateTime = DateTime.Now;
             user.UserName = model.UserName;
 
-            var result = await _userService.AddAsync(user);
-            var reuslt1 = await _userService.UpdateUserRolesAsync(user.Id, model.UserRoles);
+            var addUserResult = await _userService.AddAsync(user);
+            var addUserRoleResult = await _userService.UpdateUserRolesAsync(user.Id, model.UserRoles);
 
-            if (result)
+            if (addUserResult)
             {
                 dynamic param = new ExpandoObject();
                 param.userName = this.GetCurrentUserName();
@@ -124,8 +124,8 @@ public async Task<IActionResult> Add([FromBody] UserVM model)
 
             return Json(new
             {
-                success = result && reuslt1,
-                message = !(result && reuslt1) ? "添加用户失败，请查看错误日志" : ""
+                success = addUserResult && addUserRoleResult,
+                message = !(addUserResult && addUserRoleResult) ? "添加用户失败，请查看错误日志" : ""
             });
         }
 
diff --git a/AgileConfig.Server.Apisite/appsettings.Development.json b/AgileConfig.Server.Apisite/appsettings.Development.json
index a62e05af..e6613074 100644
--- a/AgileConfig.Server.Apisite/appsettings.Development.json
+++ b/AgileConfig.Server.Apisite/appsettings.Development.json
@@ -40,18 +40,20 @@
     "Audience": "agileconfig.admin", // 接收者
     "ExpireSeconds": 86400 // 过期时间
   },
+
   "SSO": {
-    "enabled": false,
-    "loginButtonText": "SSO",
+    "enabled": true, // 是否启用 SSO
+    "loginButtonText": "SSO",// 自定义 SSO 跳转按钮的文字
     "OIDC": {
-      "clientId": "2bb823b7-f1ad-48c7-a9a1-713e9a885a5d",
-      "clientSecret": "",
-      "redirectUri": "http://localhost:5000/sso",
-      "tokenEndpoint": "https://login.microsoftonline.com/7aa25791-9a8c-4be4-872f-289bfec8cddb/oauth2/v2.0/token",
-      "authorizationEndpoint": "https://login.microsoftonline.com/7aa25791-9a8c-4be4-872f-289bfec8cddb/oauth2/v2.0/authorize",
-      "userIdClaim": "sub",
-      "userNameClaim": "name",
-      "scope": "openid profile"
+      "clientId": "2bb823b7-f1ad-48c7-a9a1-713e9a885a5d", // 应用程序ID
+      "clientSecret": "", // 应用程序密钥
+      "redirectUri": "http://localhost:5000/sso", //OIDC Server 授权成功后的回调地址 
+      "tokenEndpoint": "https://login.microsoftonline.com/7aa25791-9a8c-4be4-872f-289bfec8cddb/oauth2/v2.0/token", // Token Endpoint, code换取token的地址
+      "tokenEndpointAuthMethod": "client_secret_post", //获取token的接口的认证方案：client_secret_post, client_secret_basic, none. default=client_secret_post.
+      "authorizationEndpoint": "https://login.microsoftonline.com/7aa25791-9a8c-4be4-872f-289bfec8cddb/oauth2/v2.0/authorize", // OIDC Server 授权地址
+      "userIdClaim": "sub", // id token 中用户ID的 Claim key
+      "userNameClaim": "name", // id token 用户名的Claim key
+      "scope": "openid profile" // 请求的scope
     }
   }
 }
diff --git a/AgileConfig.Server.Apisite/appsettings.json b/AgileConfig.Server.Apisite/appsettings.json
index 43878fa2..f245b60f 100644
--- a/AgileConfig.Server.Apisite/appsettings.json
+++ b/AgileConfig.Server.Apisite/appsettings.json
@@ -41,18 +41,20 @@
     "Audience": "agileconfig.admin", // 接收者
     "ExpireSeconds": 86400 // 过期时间
   },
+
   "SSO": {
-    "enabled": false,
-    "loginButtonText": "",
+    "enabled": false, // 是否启用 SSO
+    "loginButtonText": "", // 自定义 SSO 跳转按钮的文字
     "OIDC": {
-      "clientId": "",
-      "clientSecret": "",
-      "redirectUri": "",
-      "tokenEndpoint": "",
-      "authorizationEndpoint": "",
-      "userIdClaim": "sub",
-      "userNameClaim": "name",
-      "scope": "openid profile"
+      "clientId": "", // 应用程序ID
+      "clientSecret": "", // 应用程序密钥
+      "redirectUri": "", //OIDC Server 授权成功后的回调地址 
+      "tokenEndpoint": "", // Token Endpoint, code换取token的地址
+      "tokenEndpointAuthMethod": "client_secret_post", //获取token的接口的认证方案：client_secret_post, client_secret_basic, none. default=client_secret_post.
+      "authorizationEndpoint": "", // OIDC Server 授权地址
+      "userIdClaim": "sub", // id token 中用户ID的 Claim key
+      "userNameClaim": "name", // id token 用户名的Claim key
+      "scope": "openid profile" // 请求的scope
     }
   }
 }
diff --git a/AgileConfig.Server.Data.Entity/UserRole.cs b/AgileConfig.Server.Data.Entity/UserRole.cs
index 3eccd429..04e902a1 100644
--- a/AgileConfig.Server.Data.Entity/UserRole.cs
+++ b/AgileConfig.Server.Data.Entity/UserRole.cs
@@ -27,9 +27,9 @@ public enum Role
         [Description("超级管理员")]
         SuperAdmin = 0,
         [Description("管理员")]
-        Admin,
+        Admin = 1,
         [Description("操作员")]
-        NormalUser, 
+        NormalUser = 2, 
     }
 
     public enum AppRole
diff --git a/AgileConfig.Server.OIDC/IOidcClient.cs b/AgileConfig.Server.OIDC/IOidcClient.cs
index 29ecdbf2..2afbbc29 100644
--- a/AgileConfig.Server.OIDC/IOidcClient.cs
+++ b/AgileConfig.Server.OIDC/IOidcClient.cs
@@ -5,6 +5,6 @@ public interface IOidcClient
         OidcSetting OidcSetting { get; }
         string GetAuthorizeUrl();
         (string Id, string UserName) UnboxIdToken(string idToken);
-        Task<TokenModel> Validate(string code);
+        Task<(string IdToken, string accessToken)> Validate(string code);
     }
 }
\ No newline at end of file
diff --git a/AgileConfig.Server.OIDC/OidcClient.cs b/AgileConfig.Server.OIDC/OidcClient.cs
index 22b8c866..b13fcab8 100644
--- a/AgileConfig.Server.OIDC/OidcClient.cs
+++ b/AgileConfig.Server.OIDC/OidcClient.cs
@@ -1,5 +1,8 @@
-using Newtonsoft.Json;
+using AgileConfig.Server.OIDC.SettingProvider;
+using AgileConfig.Server.OIDC.TokenEndpointAuthMethods;
+using Newtonsoft.Json;
 using System.IdentityModel.Tokens.Jwt;
+using System.Net.Http.Headers;
 
 namespace AgileConfig.Server.OIDC
 {
@@ -27,39 +30,34 @@ public string GetAuthorizeUrl()
             return url;
         }
 
-        public async Task<TokenModel> Validate(string code)
+        public async Task<(string IdToken, string accessToken)> Validate(string code)
         {
-            var httpclient = new HttpClient();
-            var kvs = new List<KeyValuePair<string, string>>() {
-                new KeyValuePair<string, string>("code", code),
-                new KeyValuePair<string, string>("grant_type", "authorization_code"),
-                new KeyValuePair<string, string>("redirect_uri", _oidcSetting.RedirectUri),
-                new KeyValuePair<string, string>("client_id", _oidcSetting.ClientId),
-                new KeyValuePair<string, string>("client_secret", _oidcSetting.ClientSecret),
-            };
-            var form = new FormUrlEncodedContent(kvs);
-            var response = await httpclient.PostAsync(_oidcSetting.TokenEndpoint, form);
+            var authMethod = TokenEndpointAuthMethodFactory.Create(_oidcSetting.TokenEndpointAuthMethod);
+            var httpContent = authMethod.GetAuthHttpContent(code, _oidcSetting);
+
+            using var httpclient = new HttpClient();
+            if (!string.IsNullOrEmpty(httpContent.BasicAuthorizationString))
+            {
+                httpclient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", httpContent.BasicAuthorizationString);
+            }
+            var response = await httpclient.PostAsync(_oidcSetting.TokenEndpoint, httpContent.HttpContent);
             response.EnsureSuccessStatusCode();
+
             var bodyJson = await response.Content.ReadAsStringAsync();
             if (string.IsNullOrWhiteSpace(bodyJson))
             {
-                throw new Exception("Can not validate the code. The token endpoint return the empty response.");
+                throw new Exception("Can not validate the code. Token endpoint return empty response.");
             }
 
-            dynamic responseObject = JsonConvert.DeserializeObject<dynamic>(bodyJson);
-            string access_token = responseObject.access_token;
+            var responseObject = JsonConvert.DeserializeObject<TokenEndpointResponseModel>(bodyJson);
             string id_token = responseObject.id_token;
 
-            if (string.IsNullOrWhiteSpace(access_token) || string.IsNullOrWhiteSpace(id_token))
+            if (string.IsNullOrWhiteSpace(id_token))
             {
-                throw new Exception("Can not validate the code. Access token or Id token missing.");
+                throw new Exception("Can not validate the code. Id token missing.");
             }
 
-            var obj = new TokenModel();
-            obj.IdToken = id_token;
-            obj.AccessToken = access_token;
-
-            return obj;
+            return (id_token, "");
         }
 
         public (string Id, string UserName) UnboxIdToken(string idToken)
@@ -72,10 +70,10 @@ public async Task<TokenModel> Validate(string code)
         }
     }
 
-    public class TokenModel
+    internal class TokenEndpointResponseModel
     {
-        public string IdToken { get; set;}
+        public string id_token { get; set; }
 
-        public string AccessToken { get; set;}
+        public string access_token { get; set; }
     }
 }
\ No newline at end of file
diff --git a/AgileConfig.Server.OIDC/OidcSetting.cs b/AgileConfig.Server.OIDC/OidcSetting.cs
index 5f5470f6..f9ee165b 100644
--- a/AgileConfig.Server.OIDC/OidcSetting.cs
+++ b/AgileConfig.Server.OIDC/OidcSetting.cs
@@ -10,7 +10,9 @@ public OidcSetting(
             string authorizationEndpoint, 
             string userIdClaim, 
             string userNameClaim, 
-            string scope)
+            string scope,
+            string tokenEndpointAuthMethod
+            )
         {
             ClientId = clientId;
             ClientSecret = clientSecret;
@@ -20,6 +22,7 @@ public OidcSetting(
             UserIdClaim = userIdClaim;
             UserNameClaim = userNameClaim;
             Scope = scope;
+            TokenEndpointAuthMethod = tokenEndpointAuthMethod;
         }
 
         public string ClientId { get; }
@@ -30,5 +33,6 @@ public OidcSetting(
         public string UserIdClaim { get; }
         public string UserNameClaim { get; }
         public string Scope { get; }
+        public string TokenEndpointAuthMethod { get; set; }
     }
 }
diff --git a/AgileConfig.Server.OIDC/ServiceCollectionExt.cs b/AgileConfig.Server.OIDC/ServiceCollectionExt.cs
index bd28096e..d38fd6a4 100644
--- a/AgileConfig.Server.OIDC/ServiceCollectionExt.cs
+++ b/AgileConfig.Server.OIDC/ServiceCollectionExt.cs
@@ -1,4 +1,5 @@
-using Microsoft.Extensions.DependencyInjection;
+using AgileConfig.Server.OIDC.SettingProvider;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace AgileConfig.Server.OIDC
 {
diff --git a/AgileConfig.Server.OIDC/ConfigfileOidcSettingProvider.cs b/AgileConfig.Server.OIDC/SettingProvider/ConfigfileOidcSettingProvider.cs
similarity index 75%
rename from AgileConfig.Server.OIDC/ConfigfileOidcSettingProvider.cs
rename to AgileConfig.Server.OIDC/SettingProvider/ConfigfileOidcSettingProvider.cs
index 81ff5709..1ce07df2 100644
--- a/AgileConfig.Server.OIDC/ConfigfileOidcSettingProvider.cs
+++ b/AgileConfig.Server.OIDC/SettingProvider/ConfigfileOidcSettingProvider.cs
@@ -1,7 +1,7 @@
 using AgileConfig.Server.Common;
 using Microsoft.Extensions.Logging;
 
-namespace AgileConfig.Server.OIDC
+namespace AgileConfig.Server.OIDC.SettingProvider
 {
     public class ConfigfileOidcSettingProvider : IOidcSettingProvider
     {
@@ -17,14 +17,15 @@ public ConfigfileOidcSettingProvider(ILogger<ConfigfileOidcSettingProvider> logg
             var userIdClaim = Global.Config["SSO:OIDC:userIdClaim"];
             var userNameClaim = Global.Config["SSO:OIDC:userNameClaim"];
             var scope = Global.Config["SSO:OIDC:scope"];
+            var tokenEndpointAuthMethod = Global.Config["SSO:OIDC:tokenEndpointAuthMethod"];
             var loginButtonText = Global.Config["SSO:loginButtonText"];
 
             _oidcSetting = new OidcSetting(
-                clientId, 
-                clientSecret, redirectUri, 
-                tokenEndpoint, authorizationEndpoint, 
-                userIdClaim, userNameClaim, 
-                scope);
+                clientId,
+                clientSecret, redirectUri,
+                tokenEndpoint, authorizationEndpoint,
+                userIdClaim, userNameClaim,
+                scope, tokenEndpointAuthMethod);
 
             logger.LogInformation($"OIDC Setting " +
                 $"clientId:{clientId} " +
@@ -34,7 +35,8 @@ public ConfigfileOidcSettingProvider(ILogger<ConfigfileOidcSettingProvider> logg
                 $"userIdClaim:{userIdClaim} " +
                 $"userNameClaim:{userNameClaim} " +
                 $"scope:{scope} " +
-                $"loginButtonText:{loginButtonText} "
+                $"loginButtonText:{loginButtonText} " +
+                $"tokenEndpointAuthMethod:{tokenEndpointAuthMethod} "
                 );
         }
 
diff --git a/AgileConfig.Server.OIDC/IOidcSettingProvider.cs b/AgileConfig.Server.OIDC/SettingProvider/IOidcSettingProvider.cs
similarity index 63%
rename from AgileConfig.Server.OIDC/IOidcSettingProvider.cs
rename to AgileConfig.Server.OIDC/SettingProvider/IOidcSettingProvider.cs
index 1cf460a4..2b0dc230 100644
--- a/AgileConfig.Server.OIDC/IOidcSettingProvider.cs
+++ b/AgileConfig.Server.OIDC/SettingProvider/IOidcSettingProvider.cs
@@ -1,4 +1,4 @@
-namespace AgileConfig.Server.OIDC
+namespace AgileConfig.Server.OIDC.SettingProvider
 {
     public interface IOidcSettingProvider
     {
diff --git a/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/BasicTokenEndpointAuthMethod.cs b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/BasicTokenEndpointAuthMethod.cs
new file mode 100644
index 00000000..6b01302b
--- /dev/null
+++ b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/BasicTokenEndpointAuthMethod.cs
@@ -0,0 +1,23 @@
+using System.Net.Http.Headers;
+using System.Text;
+
+namespace AgileConfig.Server.OIDC.TokenEndpointAuthMethods
+{
+    internal class BasicTokenEndpointAuthMethod : ITokenEndpointAuthMethod
+    {
+        public (HttpContent HttpContent, string BasicAuthorizationString) GetAuthHttpContent(string code, OidcSetting oidcSetting)
+        {
+            var kvs = new List<KeyValuePair<string, string>>() {
+                new KeyValuePair<string, string>("code", code),
+                new KeyValuePair<string, string>("grant_type", "authorization_code"),
+                new KeyValuePair<string, string>("redirect_uri", oidcSetting.RedirectUri)
+            };
+            var httpContent = new FormUrlEncodedContent(kvs);
+
+            var txt = $"{oidcSetting.ClientId}:{oidcSetting.ClientSecret}";
+            string authorizationString = Convert.ToBase64String(Encoding.UTF8.GetBytes(txt));
+
+            return (httpContent, authorizationString);
+        }
+    }
+}
diff --git a/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/ITokenEndpointAuthMethod.cs b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/ITokenEndpointAuthMethod.cs
new file mode 100644
index 00000000..35e604ac
--- /dev/null
+++ b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/ITokenEndpointAuthMethod.cs
@@ -0,0 +1,7 @@
+namespace AgileConfig.Server.OIDC.TokenEndpointAuthMethods
+{
+    internal interface ITokenEndpointAuthMethod
+    {
+        (HttpContent HttpContent, string BasicAuthorizationString) GetAuthHttpContent(string code, OidcSetting oidcSetting);
+    }
+}
diff --git a/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/NoneTokenEndpointAuthMethod.cs b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/NoneTokenEndpointAuthMethod.cs
new file mode 100644
index 00000000..695e8e11
--- /dev/null
+++ b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/NoneTokenEndpointAuthMethod.cs
@@ -0,0 +1,19 @@
+using System.Text;
+
+namespace AgileConfig.Server.OIDC.TokenEndpointAuthMethods
+{
+    internal class NoneTokenEndpointAuthMethod : ITokenEndpointAuthMethod
+    {
+        public (HttpContent HttpContent, string BasicAuthorizationString) GetAuthHttpContent(string code, OidcSetting oidcSetting)
+        {
+            var kvs = new List<KeyValuePair<string, string>>() {
+                new KeyValuePair<string, string>("code", code),
+                new KeyValuePair<string, string>("grant_type", "authorization_code"),
+                new KeyValuePair<string, string>("redirect_uri", oidcSetting.RedirectUri)
+            };
+            var httpContent = new FormUrlEncodedContent(kvs);
+
+            return (httpContent, "");
+        }
+    }
+}
diff --git a/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/PostTokenEndpointAuthMethod.cs b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/PostTokenEndpointAuthMethod.cs
new file mode 100644
index 00000000..432d12fb
--- /dev/null
+++ b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/PostTokenEndpointAuthMethod.cs
@@ -0,0 +1,19 @@
+namespace AgileConfig.Server.OIDC.TokenEndpointAuthMethods
+{
+    internal class PostTokenEndpointAuthMethod : ITokenEndpointAuthMethod
+    {
+        public (HttpContent HttpContent, string BasicAuthorizationString) GetAuthHttpContent(string code, OidcSetting oidcSetting)
+        {
+            var kvs = new List<KeyValuePair<string, string>>() {
+                new KeyValuePair<string, string>("code", code),
+                new KeyValuePair<string, string>("grant_type", "authorization_code"),
+                new KeyValuePair<string, string>("redirect_uri", oidcSetting.RedirectUri),
+                new KeyValuePair<string, string>("client_id", oidcSetting.ClientId),
+                new KeyValuePair<string, string>("client_secret", oidcSetting.ClientSecret),
+            };
+            var httpContent = new FormUrlEncodedContent(kvs);
+
+            return (httpContent, "");
+        }
+    }
+}
diff --git a/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/TokenEndpointAuthMethodFactory.cs b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/TokenEndpointAuthMethodFactory.cs
new file mode 100644
index 00000000..979400ac
--- /dev/null
+++ b/AgileConfig.Server.OIDC/TokenEndpointAuthMethods/TokenEndpointAuthMethodFactory.cs
@@ -0,0 +1,25 @@
+namespace AgileConfig.Server.OIDC.TokenEndpointAuthMethods
+{
+    internal static class TokenEndpointAuthMethodFactory
+    {
+        public static ITokenEndpointAuthMethod Create(string methodName)
+        {
+            if (methodName == "client_secret_basic")
+            {
+                return new BasicTokenEndpointAuthMethod();
+            }
+            else if (methodName == "client_secret_post")
+            {
+                return new PostTokenEndpointAuthMethod();
+            }
+            else if (methodName == "none")
+            {
+                return new NoneTokenEndpointAuthMethod();
+            }
+            else
+            {
+                throw new NotImplementedException();
+            }
+        }
+    }
+}