Class II -A: authoritative core journals, which refer to internationally accepted 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 authoritative articles on the same topic published in domestic Chinese core journals, excluding other report abstracts.
Grade III-B: Important core journals refer to papers published in foreign core journals (see Handbook of Foreign Science and Technology Core Journals) or papers with important influence published in Chinese core journals of similar disciplines in China.
Grade 4 -C: general core journal papers, refer to "Overview of National Chinese Core Journals"? Papers published by Peking University Library, 2004 edition.
Grade 5 -D: Papers published in general public journals refer to papers published in domestic public journals (journal numbers "CN" and "ISSN" with postal codes).
Category VI -E: Papers published in restricted public publications refer to papers published in domestic public publications (only periodical number, no postal code).