1, the serial number is a major symbol for us to identify and select publications. The serial number is actually the ID number of the publication, which is unique. Serial numbers are divided into domestic serial numbers and international serial numbers, and their meanings and functions are different. Domestic serial numbers are as important as international serial numbers.

2. Domestic serial number, abbreviated as cn, is applicable in China. Domestic official publications all have domestic serial numbers. The domestic serial number is reviewed and issued by the General Administration of Press and Publication, and the international serial number is referred to as issn. International serial numbers are issued by issn International Center, National Center and Regional Center. Publications at home and abroad have international serial numbers, which are internationally accepted publication identity information.