The international standard book number of books will be upgraded from the current 10 to 13. The implementation date of the new 13-digit international standard book number is 65438+2007 10/. 10 ISBN system consists of four parts: group number, publisher number, book number and inspection number. Each set of numbers has a different meaning. The first group number is the area code, also called the group number, which is the code of a country, region, language or other organization group. China group number is "7", the shortest is only one digit, and the longest is five digits. The second paragraph: the publishing house number, the publishing house code assigned by the National Standard Book Number Center. The publication number of People's Posts and Telecommunications Publishing House is 165438+. The serial number of the book published by the publishing house Usually this part is used as the logo of the book managed by the publishing house. Paragraph 4: The check code is the tenth digit of the Chinese Standard Book Number, which is used for computer checking of the book number code.