SCI is an international index, and SCI periodical (alias Science Citation Index) is a world-famous periodical literature retrieval tool published in institute for scientific information, USA. It contains more than 3,700 core journals of mathematics, science, chemistry, agriculture, forestry, medicine, life science, astronomy, geography, environment, materials, engineering technology and other natural sciences published all over the world. Through strict selection criteria and evaluation procedures, the documents collected by SCI can comprehensively cover the most important and influential research achievements in the world. It mainly includes the author, title, source journals, abstracts and keywords, which can not only evaluate the academic value of articles from the perspective of literature citation, but also quickly and conveniently establish a reference network for research topics.

Including: natural science, biology, medicine, agronomy, technology and behavioral science. , mainly based on basic science. The selected publications come from 94 categories, more than 40 countries and more than 50 languages. These countries mainly include the United States, Britain, the Netherlands, Germany, Russia, France, Japan, Canada and so on. , including a certain number of China publications.