Abstract: In order to realize the non-catenary operation of lowfloor tram at intersections, a traction power system with on-board energy storage is designed and developed. In this paper, the technical requirements of vehicles, calculation and design of traction characteristics, main circuit design of traction system, design of traction power transmission system, energy management strategy of the on-board energy storage device are introduced and verified by loading test. The test result shows that the designed traction power transmission system can perform effective energy management of the on-board energy storage device, limit its charging and discharging voltage and current, and effectively use the regenerative braking energy of the whole vehicle in the braking process, improve the utilization rate of energy.