Borrowing card number is a kind of identification and identification used to manage and record borrowed books. To check the borrowing card number, you can do it in the following ways:

1. Inquire on the library website: Most university libraries will provide online inquiry systems. By inputting students' personal information, such as student number and name, you can query the borrowing card number.

2. Consultation at the information desk of the library: Students can go to the information desk of the library and provide personal information to the library staff, who will help you check the library card number.

3. Pass the student ID card or one-card card: In some schools, the student ID card or one-card card will be printed with the library card number. You can check the relevant information on these documents and find the library card number.

It should be noted that the library management system of different schools may be different, and the above methods are applicable to most cases, but the specific provisions of the school library shall prevail. If the above methods can't get the accurate card number, it is suggested to consult your library directly for specific guidance.