One kind of papers: papers collected by two international retrieval systems (databases): SCI (Extended Edition of Science Citation Index) and SSCI (Social Science Citation Index). There are two ways to identify the influence factors of a class of papers: 1. The impact factors are inquired by referring to the journal citation report (JCR) published in the second year after the academic journals are printed into publications. 2. If the JCR of the second year has not been published or failed to be published since the academic journal was printed as a publication, the impact factor shall refer to the JCR data of the previous year when the academic journal was printed as a publication.

Second-class papers: Except for the first-class papers, the papers published by EI (Engineering Index) or foreign magazines are included in any international authoritative retrieval system (database) such as MEDLINE (American Medical Abstracts), CA (American Chemical Abstracts), BA (American Biological Abstracts) and em (Dutch Medical Abstracts).

Three types of papers: subject to the classification of academic journals published by the school's scientific research management system.

Four types of papers: In addition to the classification of academic journals published by the school's scientific research management system, papers published in school journals are recognized as four types of papers by CA.