The integral saturation found in the traditional PI control, which is mostly used in the motor drive system of electric vehicles, results in a liability of the system to overshoot and oscillation. Therefore, the anti-integral saturation control strategy has been introduced into the maximum torque-current ratio control speed regulation system of permanent magnet synchronous motor (PMSM) to improve the stability of the system. The feedback algorithm is adopted to solve the higher degree torque-current equation, which helps to solve the problem of solving the high-order equation and realizes the maximum control of the torque-current ratio. Both the speed loop and current loop adopt the anti-windup PI control, which effectively restrains the integral saturation, thus reducing the overshoot of the system, and improving the motor control accuracy. A system model has been built and simulated based on Matlab/Simulink, with simulation results verifying the efficiency of the designed system in suppressing the integral saturation. With a good dynamic and steady performance, it helps to reduce the overshoot of speed, thus meeting the requirements of electric vehicle motor drive systems very well.