Abstract: According to the requirement of brushless direct current motor (BLDCM) control system for pure electric vehicle, a control system with TMS320F2812 is designed. Six channel PWM signals are generated by DSP to control the rotation of the motor, and the high precision speed regulation is realized through the variation of duty cycle.The system software adopts interrupt programming. The test results show that the response of the control system is fast, the speed is stable, and the steady state error is small.