Abstract: The influence of temperature on wing dimorphism in the virginoparae of Myzuspersicae and Lipaphis erysimi was examined by experiments under constant and natural temperature regimes supplemented by systematic sampling of field populations.The results demonstrate that low temperature promotes, while high temperature tends to suppress, the development of wings, and this promotive effect of low temperature is much stronger in M. persicae than that in L. erysimi. Observations with M. persicae on development stages sensitive to temperature showed that temperatures experienced by both the mothers and the young nymphs influence wing development, I.E., the control is both prenatal and postnatal. According to the results from this study and other relevant reports in the literature, we propose that temperature is animportant factor that should not be neglected in expounding the relationships between environmental factors and wing dimorphism in the aphid species studied.