2. The second level of paper publishing-Class A: authoritative core publications, which are internationally accepted as SCIE, EI, ISTP, SSCI and A &；; Papers included in the retrieval system by HCI (subject to the retrieval by China Institute of Science and Technology Information), or papers published on the same subject in authoritative Chinese core journals in China, excluding reportable abstracts, abstracts, news, etc.
3. Papers published in Grade III-Grade B ... papers published in important core journals, papers published in foreign core journals (see "Handbook of Foreign Science and Technology Core Journals") or papers published in domestic Chinese core journals with important influence.
4. Grade Ⅳ-C: Papers published in general core journals, published in the journal General Situation of National Chinese Core Journals. The Catalogue of Chinese Core Journals was jointly published by China Knowledge Network, China Academic Journals Network and Peking University Library Journal Work Research Association. 1992, 1996 (2nd edition), 2000 (3rd edition), 2004 (4th edition), 2008 (5th edition) and 20 1 1.
5.V -D level: Papers published in general public journals, published in domestic public journals, adopt double serial numbers (journal numbers "CN" and "ISSN" plus postal code).
6. Paper Publication Grade 6 -E: Papers published in restricted public publications refer to papers published in domestic public publications (only periodical number, no postal code).
7. Papers published in internal journals are divided into three levels (categories): internal journals must be sponsored by the education department, which can be divided into seven levels: national journals (self-run journals such as China Education Association and its special committees, Ministry of Education, etc.), eight levels-provincial journals, and nine levels-district journals.