The method for the National Railway Mall to confirm whether the product has been approved again can be achieved in the following ways:

1. Status query: Personal on the National Railway Mall website or mobile terminal In the center or merchant backend management system, you can check the status of the product to determine whether it has been approved. Generally, different logos or statuses can be used to indicate the different review stages of the product, such as pending review, reviewed, failed review, etc.

2. Notification reminder: China Railway Mall may send notifications of review results to merchants through SMS, email, site messages, etc. You can follow these notifications to keep up to date with the review status of your products.

3. Customer service consultation: If you have any questions about the product review status, you can contact the customer service staff of the National Railway Mall for consultation. They will provide you with relevant information and answer your questions.

Please note that the above methods are only common processing methods in general situations, and there may be differences in specific mall platforms. For specific mall platform policies and operating procedures, it is recommended that you check the relevant platform rules or contact the mall customer service to obtain accurate information.