1. China Science and Technology Papers Statistical Source Journal of China Institute of Science and Technology Information (also known as "China Science and Technology Core Journal"), this core mainly involves natural sciences, and now it is mainly recognized by the medical industry, and other industries rarely recognize this core, so its status is lower than that of the Chinese core (Peking University Library was selected), but in the medical industry, the utilization rate is quite high. This core has small changes every year and big changes in two years. The catalogue can be found in Baidu: China Institute of Science and Technology Information, and the latest catalogue is available in official website.

Two, the Chinese Academy of Social Sciences Literature Information Center "China humanities and social sciences core journals", mainly related to social sciences, the level is extremely high, the author must be a doctor or associate professor, to be eligible to publish articles. Its catalogue can be searched by Baidu: A Brief Introduction to the Core Journals of Humanities and Social Sciences in China.

These two cores are actually different from the selected units. They are all the core. As for which core is easy to use, it depends on the regulations of your unit, not uniform.