On the basis of analyzing the principle of single phase voltage space vector pulse width modulation (SVPWM) and narrow pulse on the damage of insulated gate bipolar transistor (IGBT),to solve the problem that the IGBT or the body diode cut off again before they are completely open because of the narrow pulse generated in pulse width modulated. During this process, the great voltage and oscillation do damage to the device and distorted the flow in converter. The method is proposed in this paper by adjusting the modulation index m to control the width to limit and eliminate the narrow pulse. It also increases the reliability of the safe operation of the circuit. Finally the method is verified by Matlab simulation can make switching devices allow through narrow pulse to increase the reliability of the safe operation of the circuit.