从随机脉宽调制（ＲＰＷＭ）原理入手，介绍了随机模型随机方案选择，并用数字信号处理器ＴＭＳ３２０Ｃ５０ 具体实现了ＲＰＷＭ 波．通过频谱分析，将ＲＰＷＭ 波与ＳＰＷＭ 波相比较，ＲＰＷＭ谐波具有抑制功能强的优点．对不同幅度调制比下的ＲＰＷＭ 波频谱进行比较，ＲＰＷＭ 对幅度调制比要求较高． Starting from the principle of random pulse width modulation (RPWM), the stochastic scheme selection is introduced, and the RPWM wave is realized by the digital signal processor TMS320C50. By spectrum analysis, RPWM wave compared with the SPWM wave, RPWM harmonic suppression has the advantage of strong. RPWM wave spectrums under different amplitude modulation ratios are compared, RPWM requires a higher amplitude modulation ratio.