Some universities and institutions classify periodicals into four categories: A, B, C and D according to their own needs. The classification method of each school and unit is different, and the schools or institutions that can classify journals into three categories: A, B and C are also ranked higher.

Class D journals are usually general journals, while Class A, B and C journals are all selected from cssci and Chinese core journals, and a few also include newspaper publications. Usually, schools and units classify the publications closest to their major as Class A, followed by Class B and Class C. ..