Based on modeling and simulation, a three-phase inverter power supply was built. The inverter output voltage and current waveform were analyzed under the conditions of no load, pure resistance load and pure inductive load, and the influence of sudden loading on and loading off on output voltage for the system was studied also. The analysis showed that the applied control strategy made the inverter power supply system output voltage stable with small waveform distortion, and the system had the advantages of good stability, good robustness and anti-interference and dynamic-response performance.