On the basis of analyzing the principle of SVPWM, this paper presents a simplified algorithm of SVPWM, which can be realized by simple four operations, and can realize the calculation of the time of sector judging and effective vector operation. In this paper, the practical physical meaning of the simplified algorithm is analyzed, and the feasibility of the proposed algorithm is verified by the permanent magnet synchronous motor controller based on STM32F407 microprocessor.