Abstract: In this paper,the influences of urban aerosols on radiation are carried out by using the data of radiation and in the temperature profiles simultaneously measured in winter both in Lanzhou city and in the contrast site around the city.The two-stream approximate method is applied to calculate the absorption heating rates of atmospheric aerosols,it is shown that the heating value is in good agreement with the temperature increment at the top of lower layer.Boundary layer temperature profiles influenced by solar radiation effects of urban aerosols are also disscused.It indicates that urban smog layer attenuates surface heat flux but increases temperature increment at both the middle and the top part of lower layer.Thus,urban smog layer enhances the boundary layer stability.