diff --git a/aliyun-net-sdk-core/Auth/CredentialsBackupCompatibilityAdaptor.cs b/aliyun-net-sdk-core/Auth/CredentialsBackupCompatibilityAdaptor.cs
index 2260d648d..903700d26 100644
--- a/aliyun-net-sdk-core/Auth/CredentialsBackupCompatibilityAdaptor.cs
+++ b/aliyun-net-sdk-core/Auth/CredentialsBackupCompatibilityAdaptor.cs
@@ -17,8 +17,11 @@
  * under the License.
  */
 
+using System;
+
 namespace Aliyun.Acs.Core.Auth
 {
+    [Obsolete("This class is obsolete.")]
     public class CredentialsBackupCompatibilityAdaptor : Credential
     {
         private readonly AlibabaCloudCredentialsProvider provider;
diff --git a/aliyun-net-sdk-core/DefaultAcsClient.cs b/aliyun-net-sdk-core/DefaultAcsClient.cs
index 6ccbd0d7d..42f91cd84 100644
--- a/aliyun-net-sdk-core/DefaultAcsClient.cs
+++ b/aliyun-net-sdk-core/DefaultAcsClient.cs
@@ -61,21 +61,21 @@ public DefaultAcsClient(IClientProfile profile) : this()
         {
             clientProfile = profile;
             credentialsProvider = new StaticCredentialsProvider(profile);
-            clientProfile.SetCredentialsProvider(credentialsProvider);
+            // clientProfile.SetCredentialsProvider(credentialsProvider);
         }
 
         public DefaultAcsClient(IClientProfile profile, AlibabaCloudCredentials credentials) : this()
         {
             clientProfile = profile;
             credentialsProvider = new StaticCredentialsProvider(credentials);
-            clientProfile.SetCredentialsProvider(credentialsProvider);
+            // clientProfile.SetCredentialsProvider(credentialsProvider);
         }
 
         public DefaultAcsClient(IClientProfile profile, AlibabaCloudCredentialsProvider credentialsProvider) : this()
         {
             clientProfile = profile;
             this.credentialsProvider = credentialsProvider;
-            clientProfile.SetCredentialsProvider(this.credentialsProvider);
+            // clientProfile.SetCredentialsProvider(this.credentialsProvider);
         }
 
         [Obsolete("readTimeout is deprecated as does not match Properties rule, please use readTimeout instead.")]