The advantages and disadvantages of PWM rectifier and traditional rectifier are firstly described in rotary steering.Based on mathematical model of threephase voltage source rectifier (VSR) in the synchronous rotating coordinate system,The doubleloop PI control and SVPWM control strategy are adopted. And the implementation process of SVPWM control is introduced in detail. Finally the system simulation is done under the MATLAB Simulink.The voltage wave of the network side,the current wave,the output voltage wave of the DC side and the current on the grid side FFT are analyzed. The simulation results show that the proposed control strategy can realize the phase synchronization of voltage and current on the power supply side. The harmonic content is low and the DC side voltage reaches a set point rapidly, thus meeting the power supply stability of the rotating steering system.