In order to understand the impact of global warming on the population dynamics of the wheat aphids,Sitobion avenae and Rhopalosiphum padi,in wheat fields across different latitudes,the field experiments of temperature-elevation(Te) with infrared radiator heating device were conducted at two latitudes:Langfang City(39°30' N,116°36' E),Hebei Province andYuanyang County(34°55' N,114°15' E),Henan Province.The population dynamics of S.avenae and R.padi were investigated in the two tested areas with Te treatment(+2.00℃) and control in Langfang,and Te treatment(+1.18℃) and control in Yuanyang,and the ratio value of two aphid populations was calculated during the peak stage.The results showed that,for S.avenae,warming advanced the initial appearance and peak period by 21 d,7 d in Langfang,and 14 d,14 d in Yuanyang,respectively,but for R.padi,the advancement(by 31 d,7 d) only occurred in Yuanyang.Warming significantly increased the abundance of S.avenae at peak stage and the peak values were increased by 139.21%,77.83% in Langfang and 149.62%,176.52% in Yuanyang,respectively;R.padi increased by 157.31%,130.16% only in Langfang,but the ratio value of R.padi to S.avenae was significantly decreased by 43.21% in Yuanyang.The results indicated that warming benefited both aphid populations at the relative higher latitude like Langfang,but only benefited S.avenae population at the relative lower latitude like Yuanyang.