PIC单片机含具有PWM功能的外围功能模块（CCP），利用此模块更容易通过软件实现SPWM，且具有更快的执行速度。本文采用软硬件结合设计的方法，利用面积等效法，并且基于PIC单片机实现对试验逆变系统的SPWM控制。 -PIC microcontroller has a PWM function with the external function module (CCP), more easily using this module software SPWM, and has a faster speed of execution. In this paper, hardware and software design methods, using the equivalent area, and the test based on PIC MCU SPWM controlled inverter system.