In order to handle the situation of power system grounding fault better, this paper built the mathematical model of power system resonance grounding fault based on the resonance grounding principle. And simulated the resonance processes by using MATLAB/SIMULINK/ SIMPOWERSYSTEM (SPS) software. The obtained results show that there will appear zero sequence current at each point of power system when the grounding faults occurrs. And if the circuit has the point of biggest amplitude of zero sequence current, then it is just the fault phases. The simulation data further verified that arc suppression coil grounding could directly decreases the grounding current when the single-phase grounding fault occurred. Moreover, it effectively eliminates the arc from the process and becomes the more reasonable grounding mode