The toxicity of abamectin on different developmental stages of Trichogramma evanescens and effects on its population dynamics were studied. The results showed that emergence rate of T. evanescens from Corcyra cephaloica S. eggs was significantly inhibited when parasitized host eggs were sprayed with abamectin at the field recommended concentration. Longevity of emerged female T. evanescens was reduced when treated with abamectin during in preimaginal stages with the exception of egg stage. Exposed to abamectin during prepupal and pupal stages could resulted in 43.3%-47.2% of female brachyptery, and high impact of abamectin on T. evanescens was observed with the parasitoid development. Based on the dose-response study, the LC50 value was 2.1991mg?L-1 when adult was exposed to fresh dry insecticide film, which indicats that adult T. evanescens was susceptible to abamectin. Under conditions of greenhouse, effectiveness of abamectin lasted for 10d for adult Trichogramma evanescens, which demonstrates that the pesticide was classified as slightly persistent. Number of parasitized eggs per emerged female adult was significantly reduced when parasitized host eggs were sprayed with LC35 dose of abamectin at pupal stage. However, longevity of emerged female adult, F1 emergence ratio and F1 sex ratio were not affected significantly by the sub-lethal dosage treatment. Adult life table parameters indicated that net reproductive rate and mean generation time in LC35 treatment were obviously lower than those in the control, but intrinsic rate of increase, finite rate of increase and doubling time were similar among LC35 treatment and the control. It was suggested that population dynamics of T. evanescens might not be affected significantly by sub-lethal dose of abamectin.