The harmonic problem of sinusoidal pulse-width modulation (SPWM) inverter output can be well dealt with by traditional repetitive control,but the control system tends to be unstable at low sampling rate. In the field of using high power inverter,the switching frequency of power devices is always lower. So the sampling frequency of the control system is relatively lower. And there will be difficulties in traditional repetitive control application. The phase compensation in repetitive control is improved and fractional phase lead repetitive control is proposed. The stability margin of the system is improved and steady-state error is reduced by the method. Simulation results show that fractional phase lead repetitive control has better stability.