Target enzyme plays an extremely important role in research and development of chemical pesticides. Most of the targets of newly developed high active pesticides are variety of important metabolic enzymes. Understanding the mechanism of target enzyme will help to investigate and develop novel pesticides with high efficiency, low toxicity arid good specificity. This paper focuses on introducing the roles of target enzyme playing in research anddevelopment of pesticides, the action mechanism of herbicides and insectides on the target enzyme, the type or species of pesticides which have been deve...