This paper presentes the structure of PMSM vector control system, the principle and realization of space vector pulse width modulation(SVPWM). Modeling and simulation of the system is conducted under MATLAB condition, which establishes the inner currentloop and the outer speed-loop by using Simulink & SimPower Systems. The simulation results indicate that PMSM vector control system has good characteristics of dynamic response speed control, and the id=0 control algorithm is also verified.