Aiming at the driving circuit design of a small brushless direct current (DC) motor, at first, the working principle of brushless DC motor is analyzed. And then, the parameter confirmation of the related device of brushless DC motor pulse width modulation (PWM) control based on digital signal processor (DSP) is discussed. At last, the drive control circuit is developed. Through the voltage regulation and frequency modulation (FM) test of the circuit, the validity and feasibility of the scheme is verified.