This paper analyzes the commutation process of brushless dc motor, the control structure, control chip, control technology and control strategy of the system are also determined. In order to improve the system speed performance, the three closed-loop structure of position, speed and current is adopted in the control structure. Most functions of the system are realized by more reasonable software, therefore system reliability will be improved. In view of the problems of classical PID algorithm in brushless dc motor speed, the integral separation PID control algorithm is adopted，and successfully applied to this design. Aiming at BLDC turntable PWM mode is used, the hardware and software design with DSP+FPGA as the control core is completed. The performance of the whole design is validated by relying on the indoor experimental platform. The sketchy tracking accuracy of the system reaches 41 µrad, which meets the system requirements. The debugging results show that the system has good dynamic and static function[1].