diff --git a/keyBoard/Class/Manager/AppleSignInManager.h b/keyBoard/Class/Manager/AppleSignInManager.h
index 5c2b73d..05dc7c6 100644
--- a/keyBoard/Class/Manager/AppleSignInManager.h
+++ b/keyBoard/Class/Manager/AppleSignInManager.h
@@ -26,6 +26,9 @@ typedef void (^KBAppleSignInCompletion)(ASAuthorizationAppleIDCredential * _Null
 /// 返回：ASAuthorizationAppleIDProviderCredentialAuthorized/Revoked/NotFound
 - (void)checkCredentialStateWithCompletion:(void(^)(ASAuthorizationAppleIDProviderCredentialState state))completion;
 
+/// 使用给定 userIdentifier 检查凭证状态（推荐：从服务端返回的 userIdentifier）
+- (void)checkCredentialStateForUserID:(NSString *)userID completion:(void(^)(ASAuthorizationAppleIDProviderCredentialState state))completion;
+
 /// 最近一次成功登录的 userIdentifier（已持久化）
 @property (nonatomic, readonly, nullable) NSString *storedUserIdentifier;
 
diff --git a/keyBoard/Class/Manager/AppleSignInManager.m b/keyBoard/Class/Manager/AppleSignInManager.m
index 1cb02b7..f92be26 100644
--- a/keyBoard/Class/Manager/AppleSignInManager.m
+++ b/keyBoard/Class/Manager/AppleSignInManager.m
@@ -63,14 +63,30 @@ static NSString * const kKBAppleUserIdentifierKey = @"com.company.keyboard.apple
     }
 }
 
+// 使用指定的 userIdentifier 检查凭证状态（无需本地存储）
+- (void)checkCredentialStateForUserID:(NSString *)userID completion:(void(^)(ASAuthorizationAppleIDProviderCredentialState state))completion {
+    if (!completion) return;
+    if (@available(iOS 13.0, *)) {
+        if (userID.length == 0) {
+            completion(ASAuthorizationAppleIDProviderCredentialNotFound);
+            return;
+        }
+        ASAuthorizationAppleIDProvider *provider = [ASAuthorizationAppleIDProvider new];
+        [provider getCredentialStateForUserID:userID completion:^(ASAuthorizationAppleIDProviderCredentialState credentialState, NSError * _Nullable error) {
+            dispatch_async(dispatch_get_main_queue(), ^{ completion(credentialState); });
+        }];
+    } else {
+        completion(ASAuthorizationAppleIDProviderCredentialNotFound);
+    }
+}
+
 #pragma mark - 授权回调 (ASAuthorizationControllerDelegate)
 
 - (void)authorizationController:(ASAuthorizationController *)controller didCompleteWithAuthorization:(ASAuthorization *)authorization API_AVAILABLE(ios(13.0)) {
     if (@available(iOS 13.0, *)) {
         ASAuthorizationAppleIDCredential *credential = authorization.credential;
-        // 持久化保存 userIdentifier，便于后续校验凭证状态
-        NSString *userID = credential.user;
-        [self.class keychainSave:kKBAppleUserIdentifierKey value:userID];
+        // 不在本地持久化 userIdentifier，统一交给服务端处理
+        // NSString *userID = credential.user; // 如需本地缓存，请自行决定是否保存
         if (self.completion) {
             self.completion(credential, nil);
         }