To check the regularity of the book, you can follow the following steps: 1 Visit a national or public library. These libraries usually had a database of books that could be used to check the books 'IPs and book numbers. 2. Visit the China National Book Trading Corporation. The company is a Chinese company responsible for the import and export of books. You can find relevant information about the evaluation of titles and publishing of books on its website. 3. Visit the China National Press Corporation. The company is a large comprehensive company responsible for the publication of books in China. You can find relevant information about the evaluation of titles and publication of books on its website. 4. Search for information such as the author's IP and book number. You can search for relevant information in the database of the National Library or the public library, or search on the websites of the China National Book import and export (group) corporation and the China publishing group corporation. It was important to note that the accuracy of the results required the correct inquiry channels. At the same time, the authenticity of the query results needed to be verified to ensure the authenticity and accuracy of the query results.