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The brushless DC motor has the advantages of high operating efficiency, good speed regulation performance, simple structure, convenient maintenance and reliable operation, and is an ideal power source for the electric vehicle drive system; the drive motor installed on the electric vehicle is located in a complex environment and working conditions. Changeable, frequent start and stop; however, the current motor controller has slow response speed, low control precision, large stability error, and weak anti-interference ability. In order to solve these problems, through the establishment of the mathematical model of the brushless DC motor, the basic principle and implementation method of the vector control algorithm of the motor are studied, and the current and speed double closed-loop speed control system is designed, and the advanced control strategy is introduced to improve the control. Finally, through the actual test of the brushless motor controller, the experimental results show that, compared with the traditional PID control, under the same adjustment frequency. The controller designed this time has the advantages of small adjustment time, wide speed adjustment range and small speed fluctuation, which verifies the feasibility of the design.