The electric drive system is the main power source of new energy vehicles. The performance of the electric drive system directly affects the vehicle's economy and driving experience. The optimization of torque control accuracy and system efficiency depends on the accurate calibration of the motor and the motor controller. The torque control block diagram of the motor controller is analyzed. The factors affecting the accuracy of the torque control and system stability during the calibration process are analyzed. The calibration content and calibration method of the motor controller are determined. The system calibration of the motor and the motor controller is completed through the built test bench. The effectiveness of the calibration method is verified by control tests at different speeds and torques.