At present, multi-pulse rectification way is applied in urban rail traction power supply system. However, there are some disadvantages which include serious harmonic pollution and energy that cannot flow in both directions. In view of the above problems, this paper puts forward a rectifier control method based on passive control strategy. For this kind of control mode ,firstly, according to the topology of the main circuit of the voltage rectifier, the EL model of the system is established in two-phase synchronous rotating coordinate. The decoupling control strategy is used to design the controller. The strategy is used in the urban rail traction power supply system, to control the voltage of the rectifier output contact network (rail).On the basis of that, the performance of the rectifieris analyzed under load disturbance, locomotive braking and grid unbalance condition. TheSsimulationSresultsSshowSthatStheSrectifierSperformsSwellSatSSstability,Santi-jamming,SunitSpowerSfactorSoperatingScharacteristics.SThis paper provides aSgoodStheoreticalSbasisSforSurbanSrailStractionSpowerSsupplySsystem.