Analysis of the dynamic characteristics of the motor drive system for electric vehicle powertrain finish that matches the parameters has important theoretical significance. From the perspective of the vehicle driver made ​​electric vehicle motor drive system ideal power features: below the rated speed constant torque, higher than the rated speed constant power. Motor drive system peak operating characteristics Rated operational characteristics of electric vehicles powertrain parameters match the main basis for calculation. Motor base speed and maximum speed of the vehicle acceleration performance selection plays a decisive role