The current chopping control is usually applied to switched reluctance motor (SRM) in the starting and at low speed setting. However, it exists large torque ripple in this control system. Thus this paper designs a hysteresis comparator that could change the current limit which is based on the traditional current chopping control. It is aim to optimize sawtooth waveform and reduce the torque ripple by changing the width of the chopped current. The simulation results show that the proposed method is reasonable and effective, which provides a new thoughtway for the design of the current chopper control system and the reduction of torque ripple.