The basic format of numbering is: type name+book serial number. For example, a library has 100 kinds of science and technology books, and the administrator can make these 100 kinds of books: science and technology 1, science and technology 2, science and technology 3, science and technology 4, ... science and technology 100. When numbering, books with similar contents should be grouped together as much as possible to facilitate management. For example, the book numbers of science and technology, crop cultivation and cultivation should be concentrated together, and the book numbers of poultry and livestock should be concentrated together. In the cultural category, the numbers of literary books such as novels, essays and poems should be grouped together, and the numbers of historical books such as biographies and historical stories should be grouped together.