The International Standard Book Number (ISBN) is an international unified numbering system to meet the needs of book publishing and management and facilitate the international exchange and statistics of publications. It consists of a group of ten digits with the code "ISBN" (978), which is used to identify the country or language, publishing institution, title, version and binding method of the publication. This set of figures can also be said to be the representative figures of books. ISBN helps to simplify the book distribution and management procedures, and facilitates publication statistics and international exchanges. Publishers, booksellers and libraries all over the world can quickly and effectively identify a book, its version and binding form by using the international standard book number. No matter what language the original book is written in, it can be ordered by telegram or telephone fax and processed by computer.

When making a barcode, the code of the book in the EAN code is 978, that is, just change the country code part of the EAN to 978, and then recalculate the check code, which is the ISBN barcode. Other processes are the same. The picture shows the structure of ISBN. Simply put, the corresponding relationship between ISBN and EAN is: 978+ISBN first 9 codes +EAN check code.