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In this paper, the method of vector control was used to improve the precision of permanent magnet synchronous motor (PMSM) control system which was a multi-variable and strongly coupling control system. Firstly, this paper established a mathematical model of PMSM under the three-phase stationary coordinate frame, and then the Clark and Park coordinate transformations are carried out according to the principle of equal amplitude and constant total magnetomotive force to obtain another model of PMSM in the two-phase rotating coordinate system. Secondly, the voltage space vector pulse width modulation (SVPWM) technology is deeply studied in this paper. In order to improve the accuracy of the closed-loop control of PMSM, the modulation method of seven segment was adopted to generate the PWM waveform which could act on the inverter. Finally, a simulation model of the PMSM control system is established in MATLAB/Simulink to verify the performance of vector control technology. And the results show that the high precision control of PMSM can be achieved by the vector control technology.