The preserved library is a closed-shelf reading library. If you can't find the books you need in the open-shelf reading area and the basic library, you can read the saved books. You need a reader's card to read the saved books. After you find the books, you need the staff to make an appointment on your behalf. So you need to make an appointment in the reading area on the north side of the fourth floor of the North District of the National Library, from 9 am to 3 pm every day. You can read until 9 pm from Monday to Friday and only until 5 pm on weekends. Please also pay attention to the time. Books published within 40 years can be copied, and the previous ones can only be photographed and scanned.