Abstract: Low-level wind shear is a phenomenon in which the wind speed or direction changes significantly in the horizontal or vertical direction in the near-surface atmosphere at lower altitudes. This change is very sudden and strong, especially during the take-off and landing stage, which poses a serious safety threat and can easily lead to serious crash accidents. However, due to the suddenness, short time and undetectability of low-level wind shear, it is difficult to obtain real wind field data directly, so simulation data is generally used at present. In this paper, real terrain data is added to the fluid dynamics numerical simulation method, and the real terrain data is used to constrain the simulation boundary conditions of wind shear wind field, and the simulation data of low-altitude wind shear wind field under complex terrain environment is obtained. Then, the sparse restoration method is used to suppress ground clutter and estimate wind shear wind velocity. Experimental results show that the wind field data obtained by this method can better reflect the influence of complex terrain environment on wind shear field, and the distance dependence of ground clutter is more obvious.