The first and second zones are the unique periodical classification standards of sci periodicals. Sci divides the retrieved journals into four regions according to the level of impact factors, namely, the first region, the second region, the third region and the fourth region, corresponding to different publications. Among the four regions, one region has the highest impact factor and the four regions have the lowest, so the papers published in one region and two regions correspond to those published in one region and two regions.

Journals in sci and II regions belong to journals with high impact factors, especially those in I region, which can be said to be the best academic journals in the world. Therefore, it can be imagined that the authors who can be published in the I-zone journals are often experts, professors and scholars who have certain influence on this subject at home and abroad, and it is difficult for ordinary authors to reach this height.

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It is relatively easy to publish sci papers in the second district, so it is more common to publish sci papers in the second district of China, such as doctoral thesis, promotion of deputy senior titles or senior titles. It is very common for ordinary authors to publish sci papers for personal development, so it is enough to choose two-zone journals. If there is no special requirement for publishing division, it is also possible to publish periodicals in the third and fourth districts. The higher the division, the more difficult it is to publish.

It should be noted that the author should know which zoning standards are applicable. Sci journals have two zoning standards, one is formulated by Chinese Academy of Sciences and the other is jcr zoning. The biggest difference between the two zoning standards is that the impact factor interval is different, so it is slightly different. For more questions about the division of sci journals, please consult the online editing of the topic station.