In order to enable equipments to be noninterference in each other's normal work among equipments, consideration must be given to both the heat dissipation of equipments and the electromagnetic compatibility of equipments with the increase of HF electronic equipments and their dense distribution. This paper analyzes and calculates the radiation fields of the louver of HF electronic equipments, the common rectangular and circular louver's radiation field by analytical method, and then compares the both field results. Under condition that louvers are made in HF electronic equipments, and the outcome electromagnetic wave's frequency is known, i.e. the wavelength is constant, the width of rectangular louver should be less than or equal to 0.1λ, and the smaller the size of rectangular louver, the better the its performance, and the bigger the length-width ratio, the better the its performance. In the condition of same area of louver, the radiation fields of circular louver are smaller than that of rectangular one. The best way is to make a circular louver, and the diameter of a louver should be less than or equal to 0.1λ as far as possible. In this case the radiation field of louver is the smallest, and its influence on external equipments and internal circuits is comparatively weak.