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In allusion to the deficiency of traditional control of BLDCM, this paper studies the realization of expert self-adjusting PID motor control system in the DSP control theory framework. The DSP chip to calculate the rotor speed of BLDCM at the same time to completed these works of Information analysis processing and coordinate the various components. Transfers the difference to expert self-adjusting PID controller after comparing the calculated results with the PC setting value, By using the advantage of expert self-adjusting PID controller to parameter tuning is rapid, accurate, convenient and flexible. Thus output the appropriate PWM duty ratio to control the speed, So as to realize the motor closed-loop control. Compared with common PID control simulation results, the simulation results show that fast response, small error, and good anti jamming ability verified the effectiveness of the program, It has a certain reference meaning in the real application .