There are many ways to classify periodicals. It is absolutely necessary for teaching and scientific researchers to master the classification of periodicals, and we often hear the saying that first-class periodicals are second-class periodicals. The definition of secondary periodicals is as follows:

According to this classification, the core periodicals are a kind of periodicals, and the general periodicals are a kind of periodicals. Look at its competent unit. Ministerial units are in charge of national publications, such as the Ministry of Health and the Ministry of Education, China xx Group and China xx Society.

Method for identify regular periodicals:

Domestic public periodicals are allowed to be distributed at home and abroad, with a unified domestic serial number. Their serial number structure is: CN newspaper registration number/classification number. Only ISSN international serial numbers without a unified domestic serial number are not allowed to be publicly issued in China, and some are printed with CN(HK) or CNXXX (HK)/R, which are domestic serial numbers fabricated by domestic lawless elements to deceive readers who are eager to publish papers. The legal domestic unified serial number shall be indicated. Generally speaking, domestic official periodicals have the competent units of domestic state organs (non-China/China XX Association), and there are detailed editing and publishing mailing addresses and printing and publishing places in China. In addition to self-issuance, most of them are subscribed through the post office, so there are often postal codes. However, illegal periodicals only have international standard serial numbers or domestic CN serial numbers, even if they are "internal newspaper certification".

To sum up, papers published in international journals and magazines that have certain international influence and domestic approval numbers can be used by authors to improve their international popularity and influence. Of course, papers published in illegal journals may not be recognized in China. It should be said that it is meaningless to evaluate professional titles. As for how to resist the prevalence of these "illegal periodicals", on the one hand, the domestic press and publication departments should seriously investigate and deal with these "periodicals" to prevent legitimate newspapers from becoming such "periodicals"

The standard format of CN serial number is: CN XX-XXXX, in which the first two digits are the area numbers of provinces, autonomous regions and municipalities directly under the Central Government, and CN(HK/H) or CNXXX(HK)/NR/R is printed, which is not a legal domestic unified serial number.

The first two XX codes in the format are as follows:

1 1. Beijing 12. Tianjin 13. Hebei 14. Shanxi 15. Inner Mongolia autonomous region 2 1. Liaoning 22. Jilin 23. Heilongjiang 3 1. Shanghai. 7. Shandong Province 4 1. Henan province. Hubei province. Hunan province. Guangdong province. Guangxi Zhuang Autonomous Region

46. Hainan province Alternate number 48. Alternate number 49. Alternate number 50. Chongqing 5 1. Sichuan 52. Guizhou 54. Xizang Autonomous Region 6 1. Shaanxi 62. Gansu 63. Qinghai 64. Ningxia Hui Autonomous Region. Xinjiang Uygur Autonomous Region.

According to state regulations, it is illegal to run a magazine in different places. If the friends who submitted the journal find that there is no serial number in the above area, they should be able to compare and judge.