I. Definition of influencing factors

Impact Factor (English: Impact Factor), abbreviated as IF, is a data in the Journal Citation Report (JCR) produced by Thomson Reuters.

That is, the total number of cited papers published by a journal in the first two years of the reporting year (JCR year) divided by the total number of papers published by the journal in these two years. This is an internationally accepted periodical evaluation index.

The impact factor has become a general index of periodical evaluation in the world. It is not only an index to measure the usefulness and exhibition of periodicals, but also an important index to measure the academic level of periodicals and even the quality of papers. The influence factor is a relative statistic.

Second, the query

To query the impact factors of Chinese journals, you can use the Comprehensive Citation Report of China Academic Journals (edited by Wan Jin, Science Press) jointly published by China Academic Journals (CD-ROM Edition) and China Scientific Literature Metrology and Evaluation Center.

The impact factors of SCI are generally published by Thomson Reuters in June each year. This is the most accurate official version, and other websites are for reference only, not 100% accurate.

The SCI periodical database under PubMed Chinese website can also query the impact factors and change curves of periodicals in recent ten years and the coverage area of periodicals.