本文以电工学正弦理论为基础；以经典的自然采样法为依托；以电子变流技术为研究对象，全面阐述了SPWM波的基本特征与个性，旨在为实验及测试提供规范的参照基准并回归于应用数学。-In this paper, the theory of Sine electrotechnics foundation　to classic based on natural sampling　electronic converter technology as the research object, comprehensively expounded the basic characteristics of SPWM wave and personality, aims to standardize the experiments and tests to provide a frame of reference and regression in Applied Mathematics.