Bookstore book classification mainly depends on the book classification system established by the library. This classification has its rationality. The readers in the book market are numerous, scattered, miscellaneous and hidden, so it is impossible for most readers to master the advanced book classification system. In this case, most bookstores are consciously adjusting their book classification methods and regard book classification as an important aspect of store design. It can be said that the book industry now pays more attention to the practicality of book classification than ever before. Specifically, it mainly presents the following characteristics. 1. Determine the category level according to business characteristics, variety scale, readers and geographical conditions, and organize its own classification system. Bookstores are divided into comprehensive and professional, big and small. For a big book city that displays 50,000 or 60,000 kinds of books, a dozen categories are obviously not enough. After the opening of Nanning Bookstore, the number of books has increased by nearly 1/3, which is naturally beneficial to saving readers' time. For those small bookstores, subdivision is trivial, which affects the beauty of bookshelves. Professional bookstores are much deeper because of their specialty, and even reach level 4, which is convenient for readers to follow the map. Regional differences often show the characteristics of classification. For example, bookstores in Guilin and Huangshan list and classify tourism books separately, apparently to promote the sales of such books under the signboard of tourist cities. 2. Adjust the category level according to the sales situation. English reading materials and supplementary books belong to the second category in Chinese Library Classification, and most bookstores treat them as a category, because these two types of books have large purchases and considerable sales codes, which can not only achieve eye-catching results, but also help to subdivide. For example, Xinhua Bookstore on Chun Qing Road in Hangzhou further subdivides English books according to their contents, uses, test grades and different reading levels, so as to facilitate readers to sit in the right position when looking for books. Although those scientific and technological books with fewer varieties have a higher category in Chinese Library Classification, they are reduced to subheadings on the bookshelves of bookstores, or several categories are generally classified as one category. For example, Shanghai Book City lowered the category level of petroleum industry and metallurgical engineering, and at the same time upgraded the computer books with large sales volume to the first-class category. This method of determining category level according to sales volume is obviously different from the pursuit of knowledge system integrity in library classification. 3. The setting of the class name makes it easier for readers to understand. Indexing the class names on the shelves can help readers find the details of the books they need.