Using insect insecticide containing relatively safe insecticidal active ingredient will shoot water dispersible granules, the toxicity can not be underestimated. To present a variety of commonly used household aerosol insecticides, insecticidal cream, mosquito tablets, mosquito and cockroach sheet like products, for example 75% of the insects will shoot water dispersible granules suppliers, they are mostly used at present generally recognized as safe in the world belong to the pyrethroid insecticide bromine ** permethrin as an active ingredient. Insecticidal effect of insecticides insect will shoot 75% water dispersible granules wholesalers, in addition to its own agents, but first must invade a certain way parasite worm will shoot high-75% water dispersible granules into the insect body reaches the site of action , then in order to work in a target site. Therefore, understanding the mode of action of insecticides on the scientific use of pesticides, improve the control effect and economic benefits, reduce pesticide pollution of the environment has important theoretical and practical value.