DC voltage utilization and output voltage harmonics are important indicators that affect the performance of an inverter. In view of an improvement of these two performances of the inverter, a new switching mode three-phase inverter, which integrates the AC side filter circuit in the Buck circuit, has thus been proposed. Free from the requirement of such passive filter components as inductors and capacitors, the AC output is characterized with no direct through and reverse recovery problems. With only one switch in each phase of the inverter working in the high frequency state, the other switche work in the low frequency soft switching state of 50 Hz. After the introduction of the quasi proportional resonance (PR) control strategy, a detailed analysis has been made of the influence of control parameters on the system performance through the control variable method, with a group of reasonable control parameters given. Finally, the simulation model of the system is to be built in Matlab/Simulink. The simulation results show that the three-phase inverter with the new switching mode can significantly improve the DC voltage utilization and output voltage waveform of the inverter.