13 digit international standard book number (ISBN- 13) consists of 13 digit, separated by four connecting digits or four spaces, and each group of digits has a fixed meaning.

The first digit segment: 978 or 979.

The second number field: indicates the country, language or location code, Chinese mainland 978-7 (Chinese).

The third group number field: indicates the publishing house code; It is distributed to various publishers by ISBN distribution centers in various countries or regions. Hebei publishing house 5434.

The fourth group number field: indicates the book order number, and the publication number is given by the publishing house.

The fifth number field: indicates the check code, with only one digit, from 0 to 9.

Extended data:

?

After the international standard book number came out, it quickly spread.

Mainly because it is initiated by publishing houses, it is of great benefit to both publishing houses and booksellers. Its advantages are: ISBN is a machine-readable code, which is consistent from book production to distribution and sales, and plays a huge role in the book distribution system;

Its introduction simplifies the branch procedures of any book industry, such as book ordering, inventory control, accounting and output processes; ISBN can also promote the ordering, purchasing, cataloging and circulation procedures of libraries and document centers. The introduction of ISBN system also serves the flow and use of bibliographic information, providing economic bibliographic control for a country's book production;

ISBN is more effective for the book market. It can identify any internationally published book and its publishing house. In the book industry, it is customary to call ISBN book number because it is widely used in stack management. It can be seen that it plays a great role in the development of the book industry.