Abstract: The bioactivity of Three extracts from Stellera chamaejasme (chloroform, petroleum ether and ethyl acetate) are studied, The result showed that: the contact toxicity of Chloroform against Schizaphis graminum were 77.95%, the calibrated mortality at a concentration of 50mg/ml is 95.00%. The antifeedant of chloroform extract against Brevicoryne brassicae L. was strongest among the extracts, the calibrated antifeedant rate is 87.85%. The antifeedant rate of four concentration(50mg/ml, 25mg/ml, 16.67mg/ml and 12.5mg/ml) of chloroform extract is 91.84%, 87.04%, 87.71% and 84.82%, respectively.