SCI, namely "scientific citation index", is an important periodical abstract index database in the field of basic theory of natural science. It was founded in 196 1 by eugene garfield, director of institute for scientific information (1925.9. 15). With it, you can search the contents of mathematics, physics, chemistry, astronomy, biology, medicine, agricultural SCIence, computer science, materials science and other disciplines from 65438.1000000001sci, and sci is also regarded as an important basis for making discipline development plans and ranking academic achievements by academic circles at home and abroad.