diff --git a/backend/internal/service/account_service.go b/backend/internal/service/account_service.go
index a5b9cd7f..7d2d3b70 100644
--- a/backend/internal/service/account_service.go
+++ b/backend/internal/service/account_service.go
@@ -208,20 +208,23 @@ func (s *AccountService) Update(ctx context.Context, id int64, req UpdateAccount
 		account.Status = *req.Status
 	}
 
-	if err := s.accountRepo.Update(ctx, account); err != nil {
-		return nil, fmt.Errorf("update account: %w", err)
-	}
-
-	// 更新分组绑定
+	// 先验证分组是否存在（在任何写操作之前）
 	if req.GroupIDs != nil {
-		// 验证分组是否存在
 		for _, groupID := range *req.GroupIDs {
 			_, err := s.groupRepo.GetByID(ctx, groupID)
 			if err != nil {
 				return nil, fmt.Errorf("get group: %w", err)
 			}
 		}
+	}
 
+	// 执行更新
+	if err := s.accountRepo.Update(ctx, account); err != nil {
+		return nil, fmt.Errorf("update account: %w", err)
+	}
+
+	// 绑定分组
+	if req.GroupIDs != nil {
 		if err := s.accountRepo.BindGroups(ctx, account.ID, *req.GroupIDs); err != nil {
 			return nil, fmt.Errorf("bind groups: %w", err)
 		}
diff --git a/backend/internal/service/admin_service.go b/backend/internal/service/admin_service.go
index f1eb0fc6..db207ce5 100644
--- a/backend/internal/service/admin_service.go
+++ b/backend/internal/service/admin_service.go
@@ -652,11 +652,20 @@ func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *U
 		account.Status = input.Status
 	}
 
+	// 先验证分组是否存在（在任何写操作之前）
+	if input.GroupIDs != nil {
+		for _, groupID := range *input.GroupIDs {
+			if _, err := s.groupRepo.GetByID(ctx, groupID); err != nil {
+				return nil, fmt.Errorf("get group: %w", err)
+			}
+		}
+	}
+
 	if err := s.accountRepo.Update(ctx, account); err != nil {
 		return nil, err
 	}
 
-	// 更新分组绑定
+	// 绑定分组
 	if input.GroupIDs != nil {
 		if err := s.accountRepo.BindGroups(ctx, account.ID, *input.GroupIDs); err != nil {
 			return nil, err