A certain amount of cash is pre-stored in the card and always used. According to Shenzhen local treasure's inquiry, readers can apply for a virtual reader card through the mobile service platform and must be in Shenzhen. Everyone can only apply for a reader's card, and it is only for their own use. Pre-deposit: readers can voluntarily pre-deposit a certain amount of cash to facilitate the settlement of overdue reimbursement expenses and printing expenses. So a certain amount of cash is pre-stored in the virtual reading card of Shenzhen Library, which can be used all the time. Shenzhen Library, located in Fuzhong No.1 Road, Futian District, Shenzhen, is a large modern public library invested and built by Shenzhen Municipal Government, which integrates popularization, digitalization and research. It is an important city card and symbol of "Cultural Shenzhen".