This paper introduces the three main development stages of modern chemical pesticides:natural pesticides,synthetic organic pesticides and green chemical pesticides which are super-efficient, non-toxic and non-polluting,moreover,discusses the property and characteristics of some representative pesticides in the three main development stages.

This paper gives a review on the origin, development history and theory of combinatorial chemistry, and introduces the basic methods to establish compound library. Meanwhile, it emphatically introduces the research progress of combinatorial chemistry and its application in medicament, catalyst, material, etc, and prospects the future development of combinatorial chemistry.