To apply for an adult card, you only need to bring your ID card and a deposit of (100) yuan. If you don't need a deposit after one year, you can return it in full, but you can only borrow one book at a time. If you pay (50) yuan more, you can borrow three books at a time, but the 50 yuan can deduct the book rental fee. /kloc-children under 0/4 only need to bring their household registration book and 20 yuan.