Abstract: The grounding of wind farm should not only meet the demand of power frequency short-circuit current, but also meet the requirements of lightning impulse current. If there are defects in the design of the grounding device of the wind farm, it will result in the consequences of system shock, equipment burning, the suspension of the whole field and even personnel injury. The parameter evaluation of the grounding system of the transformer substation is an im-portant part of the design of power system, and it is very important to carry out accurate and detailed simulation calculation of grounding grid parameters. The wind farm earthing design software developed in this paper mainly adopts numerical calculation method, which can consider the influence factors in the actual situation more com-prehensively and provide the help for the design, construction, and operation of wind farm.