Koch is also the Statistical Source Journal of China's Sci-tech Papers published by China Institute of Sci-tech Information, also known as the "China Sci-tech Core Journal". Subject categories mainly cover natural science and social science. In 2020, 2,506 journals were selected, including 2 106 natural science journals.

Selection criteria for scientific research:

1, the "core journals" of science and technology shall be managed dynamically for three years. Once every three years, once every three years This is a dynamic incentive mechanism for all sci-tech journals. It also leaves room for further improvement in the management and evaluation methods of "core journals" of science and technology.

2, strict science and technology "core journals" subject area total index limit. There are at most one or two "core journals" in the same subject field, so the evaluated "core journals" really play the role of a weather vane in this subject field.

3 to ensure the authority of academic experts to evaluate the "core journals" of science and technology. Under the organization of periodical management department, an expert committee for dynamic evaluation of "core periodicals" of science and technology was established. The academic level of sci-tech periodicals in a certain subject field must be decided by scientific academic experts, and cannot be evaluated exclusively by periodical management departments.