With the development of wind power utilization, more and more wind farms are built in the mountainous areas of complex terrain. In order to better conduct wind energy assessment and wind power forecast, it is necessary to understand the impact of complex terrain on the wind speed profile. Based on the thin airfoil theory and the linearization theory of the disturbance of turbulent boundary layer, the paper predicts the wind profile in the two-dimensional cross section using two-layer model. It can accurately predict the influence of terrain, pressure, stability on the growth of wind speed. bBut for the three-dimensional terrain or other factors, the model needs to be further extended to three dimensions, and combined with numerical simulation.