It's free, and the facilities are very good, such as providing free wireless Internet access, sofas and so on. You'll know if you've been there yourself.

Need documents, as far as I know, there are two kinds, citizen card is free, of course, you need money to do citizen card; You can also get a library card with a deposit of 100, and refund the money when you return the card.

There are many branches in Hangtu, where you can borrow and return books with your citizen card/library card.