The data collected by China Map Library refers to books, periodicals, newspapers, audio-visual materials and other related data information collected by China Library. These data record the basic information of all kinds of documents collected by the library, including author, title, subject words, publication year, collection place and so on. Through these data, users can know all kinds of resources owned by the library and their locations, which is convenient for users to find and use when needed. In addition, these data can also be used for library management and statistical analysis to help libraries better meet the needs of users.