As far as the difficulty of writing and publishing is concerned, whether it is writing or publishing, SCI papers are definitely much more difficult than domestic core journals. SCI papers need to be written in English, and the published journals are also top international academic journals, while domestic core papers don't need to be written in English, and the core journals are also domestic Chinese journals, so the difficulty is much lower. However, it does not mean that domestic core papers are easy to be published. Core journals are usually top journals in China, which is relatively difficult.

SCI and domestic core are two different concepts. SCI journals are the most famous among the three international retrieval systems, while core journals are only for domestic journals, which are generally divided into south core journals, north core journals and statistical source journals. As far as authority is concerned, SCI periodicals are recognized by many countries and regions and are more authoritative. The academic level represented by an SCI may be higher than that of domestic core journals, thus highlighting our own scientific research capabilities. In general, SCI is an international publication, and its gold content is definitely higher than that of the domestic core, but it is also divided into disciplines. If the domestic good journals can also exceed half of the SCI of the four regions.