[Objective]The paper was to study the effects of asarum essential oils on physiological and biochemical indices of two agricultural pests. [Method]Asarum essential oils were extracted by different methods,and their effects on physiological and biochemical indices related to the structure of body wall( chitin and phenoloxidase),the physiological and biochemical indices acting on the nervous system( Acetylcholinesterase),and the physiological and biochemical indices acting on the digestive system( protease,amylase and lipase) of Ostrinia furnacalis and Mythimna seperata were studied. [Result]Asarum essential oils had no effect no chitin content of body wall under the experimental concentration,and had no inhibitory effect but activated effect on polyphenol oxidase activity. Asarum essential oils could act on the nervous system of insect,and had strong inhibitory effect against acetylcholinesterase activity of O. furnacalis larvae,with inhibition rates of 24. 86%- 38. 79%. Asarum essential oils showed a significant activated effect on pepsin activity in midgut,but the activated amplitude became smaller with the prolongation of treatment time. Asarum essential oils showed a significant inhibitory effect on activities of amylase and lipase,indicating that it could play an insecticidal effect by inhibiting activity of amylase and lipase,and it could act on digestive system of insect. [Conclusion]The study laid the foundation for further development of asarum as botanical pesticide. [Objective] The paper was to study the effects of asarum essential oils on physiological and biochemical indices of two agricultural pests. [Method] Asarum essential oils were extracted by different methods, and their effects on physiological and biochemical indices related to the structure of body wall (chitin and phenoloxidase), the physiological and biochemical indices acting on the nervous system (Acetylcholinesterase), and the physiological and biochemical indices acting on the digestive system (protease, amylase and lipase) of Ostrinia furnacalis and Mythimna seperata were studied. ] Asarum essential oils had no effect no chitin content of body wall under the experimental concentration, and had no inhibitory effect but activated effect on polyphenol oxidase activity. Asarum essential oils could act on the nervous system of insect, and had strong inhibitory effect against acetylcholinesterase activity of O. furnacalis larvae, with inhibition rates of 24. 86% - 38. 79%. Asarum essentia l oils showed a significant activated effect on pepsin activity in midgut, but the activated amplitude became smaller with the prolongation of treatment time. Asarum essential oils showed a significant inhibitory effect on activities of amylase and lipase, indicating that it could play an insecticidal effect by inhibiting activity of amylase and lipase, and it could act on digestive system of insect. [Conclusion] The study laid the foundation for further development of asarum as botanical pesticide.