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In order to speed up the electric response rate of electric vehicle when the load changes, so as to reduce the electric energy consumption required to execute the motor control command, an electric vehicle motor control system based on the output of piecewise PWM duty ratio was designed. According to the storage capacitor power converter connection status, debugging power converter drive circuit, gear and throttle response forms of a given input circuit, joint DSP control board and soft start module, ensure that synovial excess load torque controller does not happen, which will be the core of the electric motor control system equipment components together, complete the hardware construction of the application environment. On this basis, the principle of PWM duty ratio control, using the mathematical model of switched reluctance motor to determine the pulse behavior causes, and the whole pulse interval planning into multiple block structure, complete output motor based on PWM duty ratio control behavior analysis, combined with various applications, design of the control system of the electric car motor. Experimental results showed that the segmented PWM duty cycle and output principle, under the action of load increases or decreases, and electric vehicle power they can maintain the response rate of relatively high value level, can the electricity consumption for motor control instruction execution keep in ideal numerical range, can meet the demand of practical application.