The control strategy of built-in permanent magnet synchronous motor for electric vehicle was studied, and a control system combining super-angle weakening control and SVPWM overmodulation was proposed. The front angle weak magnetic control used the three closed-loop control of the speed, current and voltage. The motor terminal voltage and the DC side voltage form the voltage control loop, which produced the motor current field. SVPWM overmodulation algorithm could effectively improve the inverter output voltage fundamental amplitude, the motor used the field weakening control mode to achieve the maximum speed after the inverter into the modulation state, the maximum expansion of the speed range. The control system was simulated and the simulation results proved the correctness and feasibility of the theoretical analysis.