Abstract: This platform is designed for measuring drive characters of motor-driven vehicles. The separately excited DC motors are used to act as load motor, with high-efficiency-motor controller, it can run smoothly at any quadrant. The electric dynamometer includes high performance torque sensor and all digital data sampling system. The system can process AC motor, DC motor, BLDC motor and PMSM motor's static and dynamic character's measurement. It can provide a valid tool for testing EV's motor driving system.