The evaluation and screening of SCI journals are conducted through peer review. Peer review refers to the evaluation of papers by experts in the same field to determine the quality and value of the papers. During the evaluation process, experts will check the research methods, data analysis, conclusions and other aspects of the paper, and give corresponding opinions and suggestions. If the paper passes the peer review, it may be accepted for publication.

In addition, SCI journals will screen papers according to some indicators. For example, journals may ask authors to provide some data or experimental results to support their research. If the authors can't provide these data or results, their articles may not be accepted for publication.