When the motor of the vehicle is switched from the motoring state to the braking state, there will be a strong impact current entering the battery, which will cause great damage to the battery. To solve this problem, a design has been proposed for the regenerative braking energy feedback system with DC/DC converter. By adopting TI’s TMS320 DSP as the processor of its hardware design, the main circuit, control circuit, driving circuit and detection circuit for its peripheral circuit, and the brushless DC motor (BLDCM) as the object, a circuit simulation model of the system has thus been built. The simulation test results show that with the super capacitor connected in parallel with each other at both ends of the battery as an energy storage element, it can avoid the impact of the current to the battery and prolong its service life. In a state of uphill climbing or sudden acceleration, the system of the vehicle can also make dynamic corresponding compensation to meet the demand of kinetic energy, thus verifying the high efficiency of the system in recovering the braking energy.