You can do it in self-service library or in the library with a double ID card. 50 yuan can only borrow two deposits and five deposits 100 yuan. You can decide whether the deposit is 50 yuan or 100 yuan. With the reader's card of Shenzhen Library, you can borrow or return books from any library in the city or self-service library, and you can also borrow them online in advance. The whole city can borrow and return.