Abstract: In order to indicate the influence of high cloud and the radiative effect of aerosol on the urban boundary layer, numerical simulation and lidar data are implemented by coupling the WRF (Weather Research and Forecasting) model and the ABL (Atmospheric Boundary Layer) model in which the influence of high cloud and aerosol radiative effect are considered. The model can present the character of urban boundary layer under the influence of high cloud and aerosol radiative effect. At night, aerosol keep warming at low levels, and high cloud increase the warming and induce surface temperature increase of 1.5 K. Aerosol keep cooling at middle and high levels, and high cloud decrease the cooling and induce temperature decrease of 0.2－0.7 K above 100 m. During the daytime, the combined action of high cloud and aerosol decreases the short wave radiation and results in surface temperature decrease of 1.3 K. Aerosol heats up at middle and high levels, high cloud decrease the heating, and the maximum temperature increasing value is 0.85 K and at 500 m. The aerosol radiative effect can counteract a part of mountain-valley breeze in the whole day, which will decrease the wind at middle and low levels. This effect of decrease is obvious during the daytime. High cloud makes a little compensation for the decrease of wind. 