Abstract: Based on analysis of the impacts of chemical medicaments on killing insects and controlling of weeds,their hazards to biology and human beings,as well as the pollution caused by the chemical materials to atmosphere,water,soil and landscape were discussed.lt was pointed out that effective controlling of insects and weeds may be done by natrual itself--by developing biotic-control methods such as utilization of the native predators of insect pests,insect sex attractants,male sterilant and etc..At the same time the current environmental management regulations should be modified and the food and medicine administration rules strengthenned up.