Chengdu library doesn't need a card to read books, it just needs to borrow books. You can study by yourself, bring your own books, have a special reading room and have your own books. You can go in and read books without a card.
The Sichuan Provincial Library is similar. You don't need a card to read books, but you need a card to borrow books.
Comparing the two libraries, the facilities in Sichuan Library are better.