Abstract: A shortwave heating rate model of the aerosol atmosphere is established in consideration of the effects of atmospheric aerosol and absorbing gases on the solar radiation under conditions of cloudlessness. The shortwave heating effect of the winter aerosol in Lanzhou is studied by using this model. The results show that the effects of the atmospheric aerosol on the solar heating of the atmosphere are significant. Based on the above work, a perfect closed mixed layer model is established and the radiative effects of aereosol on the evolution of the mixed layer are studied by using the numerical method. The results indicate that increasing of atmospheric aerosol would restrain the evolution of the mixed layer and decrease the mean potential temperature in the mixed layer.