This thesis describes a substation grounding system, which comprises of two sections, i.e. the theoretical background study and software development. In the first section, describes the basic theory the analysis and design of substation grounding system for one layer and two layer soil. For the software section, the program was written by Visual Basic version 6.0. The grounding system considered are of square grid shape, the soil resistivity can increase or decrease for two layer soil. The grounding system considered have grid pattern with rods around the perimeter. The wire used had the diameter of 10 mm and layed at the depth of 0.5 m. The result of the substation grounding design was displayed in the form of mesh and step voltage to the safty value according to IEEE standard 80-1986.