Chlorantraniliprole is a new insecticide with the characteristics of excellent insecticidal efficacy and high margins of mammalian safety.Field test results showed that 20% chlorantraniliprole SC gave excellent control effect against rice stem borer(Chilo suppressalis Walker).Spraying 20% chlorantraniliprole at concentrations of 30 g a.i./hm2 and 45 g a.i./hm2 at the egg hatching peak of Chilo suppressalis Walker,its control efficiency was above 96.72% for protecting the dead rice heart,the mortality of the larva was more than 98.48%,and the insecticide was safe to rice.