Abstract: The sarong method was used for analysizing the effect of the three kinds of pesticides(avermectin,imidacloprid and decis) for controlling Clostera anachoreta(Denis et Schiffermüller,1775). The result showed that 4 000 times and 6 000 times liquids of avermectin could get the best effect within 48 hours after application,with the mortality rate of larva reaching 100 percent. The next was decis,within 72 hours after application,the mortality rate of larva reached 93.19 percent. From the cost saving and environment protection into consideration,the order of application of three kinds of pesticides was 6 000 times avermectin liquid,4 000 times of imidacloprid liquid and 2 000 times of decis liquid.