There are some differences between SCI and EI. First of all, from the content point of view, SCI mainly includes periodicals in natural science, engineering technology, life science, medicine and health, while EI mainly includes papers, meeting minutes, technical reports and other materials in the field of engineering technology. The literature types of SCI are relatively single, while the literature types covered by EI are more extensive.
Secondly, in terms of academic evaluation, SCI journals measure their academic level and influence with impact factors, while EI has no similar impact factors. The impact factor of SCI journals refers to the ratio of the number of citations published by the journal in a specific year (that is, the number of citations by subsequent researchers) to the number of articles published by the journal, which is an important indicator to measure the academic level and influence of the journal.
Finally, in the form of publication, SCI is mainly published in the form of papers, while EI can include papers, meeting minutes, technical reports and other forms. Because of the wide coverage of SCI, the journals included in SCI are more strict, and they usually need to go through a strict review and evaluation process before they can be published.
Generally speaking, SCI and EI are international authoritative document indexing systems, and they have different characteristics and advantages. SCI is mainly suitable for research in natural science, engineering technology, life science, medicine and health, and publishing high-quality and theoretical papers. EI is suitable for publishing practical and applied papers in engineering technology and related fields. According to different research fields, researchers can choose the corresponding literature index system to retrieve and publish their own research results.