1. Open the Ctrip website and enter the hotel reservation page.
2. Enter the destination, check-in date and check-out date in the search box, and then click "Search".
3. Find the hotel you want to book on the search results page, and click the hotel name to enter the hotel details page.
4. On the hotel details page, slide down until you find the "Hotel Policy" column.
5. In the "Hotel Policy" column, you can check the hotel's certificate information, such as the hotel's business license and permit.
6. If you need more detailed certificate information, you can contact the hotel customer service or Ctrip customer service for consultation.