Abstract: The paper introduced a vector control system taking algorithm of SVPWM as the core by research on the voltage-decoupling vector control system, described the theory of voltage-decoupling vector control and simulation block-diagram of whole control system,and modeled the vector control system with Matlab/ Simulink software.After modeling the whole control system,several experiments for control system, speed-regulation of system and load torque suddenly applying and removing were implemented,and the experiment waveform were analyzed.The simulation results showed that the system not only has good capability of speed-regulation,but also good dynamic and static performance.