Abstract: Taking the three-phase 12/8 pole switched reluctance motor as the research object, the speed control system of the switched reluctance motor with the chip of TMS320F28335 as the main control unit is designed. The speed regulation system consists of software and hardware. The double closed-loop PI is used to control in the software part where the current is the inner loop and the speed is the outer loop. Based on the given speed signal, position signal and guard signal, the PWM driving signal corresponding to the conducting phase is calculated. The hardware part is primarily composed of switched reluctance motor, power converter, current detection, position detection, keyboard and LED segment display. Given a combination of position signal, speed signal and current feedback signal, the control strategy of switched reluctance motor is adjusted to work under voltage chopper control mode. After parameter adjustment experiment is completed, the reasonable proportional and integral coefficients of PI controller are selected. The rationality of the design of the control system is verified by the optimization, comparison and analysis of the experimental data.