《中国标准书号》由国际标准书号(ISBN)和“附加项目”组成。附加项目包括文献资料所属学科的分类号和该类的种次号两部分,其中,分类号按《中国图书馆图书分类法》基本大类编制。《中国标准书号》中分类号的设置,有效地弥补了国际标准书号无分类功能的缺陷,有利于文献管理部门将图书正确归类、组织 China ISBN consists of ISBN and Additional Items. The additional items include the classification number of the subject to which the literature belongs and the seed number of the class. The classification numbers are compiled according to the basic categories of “Library Classification of Books in China”. The setting of the classification number in “China ISBN” effectively makes up for the defects that ISBN has no classification function, which is conducive to document management department correctly classifying books, organizing