There is no government department in the country to classify periodicals. The so-called periodical level is only the understanding of periodical catalogue launched by periodical industry and some social organizations. The following introduction is for reference only. Although there is no national division, some professional title evaluation departments have requirements for the level of periodicals. 1. Provincial periodicals: "Provincial periodicals" refer to periodicals sponsored by institutions affiliated to provinces, autonomous regions and municipalities directly under the Central Government and periodicals (periodicals) sponsored by colleges and universities. 2. National periodicals: "National periodicals" refer to publications sponsored by state ministries and agencies, national organizations, organizations, universities and academic institutions. 3. Core Journals: At present, there are seven core journals (or source journals) selection systems in China, and all the journals in the catalogue of these source journals can be regarded as core journals. 3. 1, Chinese Core Journal of Peking University Library; 3.2. Nanjing University "China Social Science Citation Index (CSSCI) Source Journal"; 3.3. China Academy of Sciences Literature Information Center "China Science Citation Database (CSCD) Source Journals"; 3.4. China Institute of Science and Technology Information "China Science and Technology Papers Statistical Source Journal" (also known as "China Science and Technology Core Journal"); 3.5. China Core Journal of Humanities and Social Sciences, Document Information Center of Chinese Academy of Social Sciences; 3.6. China Humanities and Social Sciences magazine "China Humanities and Social Sciences Core Journal"; 3.7. "Selected Database of China Core Journals" of Wan Fang Data Co., Ltd.