As we all know, when the open-shelf lending system is adopted, it is easy to lead to the phenomenon of disorderly shelves. If you consciously label books with different colors in advance, the difference can be obvious. This practice can effectively reduce the disorder of books and ensure the normal circulation order of books. Usually, books and periodicals with high circulation rate, such as literature, art, computer and other books, have different color labels to facilitate the return of shelves, especially open-shelf lending, which is more convenient for book management.