The field demonstration experiments of rice leaf roller and striped rice borer with Chlorantraniliprole 20% SC were conducted in Jiangxi,Zhejiang,Anhui,Hubei,Hunan,Jiangsu,Sichuan Province from the year of 2008 to 2009 in China. The results indicated that the range of insecticidal activity and leaves protecting effects towards rice leaf roller were 90.2％-100.0％ (for 7 days after treatment) and 82.9％-96.8％(for 14 days after treatment) respectively,which were higher than those of fipronil 5% SC. The range of insecticidal activity and seedling (or spike) protecting effects towards striped rice borer were 89.0％-96.9％ and 82.8％-96.0％ (for 21 days after treatment) respectively,which were higher than those of fipronil 5% SC and chlorpyrifos 48% EC. The results of field demonstration experiments revealed that Chlorantraniliprole was more effective in the control of rice leaf roller and striped rice borer,which can be promoted in practice and meanwhile,the application technologies in the large field areas were provided. 