In view of the current flaw that drivers feel clumsy when turning the steering wheel quickly in case of emergency obstacle avoidance, the design method of lead angle flux weakening control has thus been designed, based on the permanent magnet synchronous motor (PMSM) speed regulation for electric power steering system (EPS). id=0 control is to be adopted when the motor speed is below the base speed, with the motor controlled by flux weakening at high speed, followed by a system simulation verification of the results by using Matlab/Simulink. The simulation results show that the flux weakening control method can effectively reduce the steering wheel torque and improve the motor speed.