Using gas chromatography, the organochlorine insecticide residual quantity was determined in some traditional Chinese medicinal herbs and soil samples gathered from three plantations in Qixia, Jiangning and Jurong around Nanjing City of Jiangsu Province. The results show that the amount of organochlorine insecticide in all soil samples is less than 0.5 mg·kg^-1, and that in crude drugs of Scrophularia ningpoensis Hemsl., Isatis indigotica Fort. and Platycodon grandiflorus （Jacq.） A. DC. is less than 0.1 mg·kg^-1. The soil condition reached the second standard of GB 15618—1995. It suggests that Yuanxiang town in Jurong is more suitable for planting traditional Chinese medicinal herbs.