In order to test the performance of a linear steering gear, an electric servo loading test system is designed, which is loaded by the permanent magnet synchronous motor and the middle of the ball screw. The mathematical model of the system was established. Combining with the control equation of the system, the stability of the system and the mechanism of the extraneous torque were analyzed. A speed loop compensation algorithm was proposed to effectively suppress the surplus torque. In order to improve the accuracy and dynamic performance of the system, fuzzy Proportion Integral Derivative (PID) control with nonuniform triangular membership function was used to replace the traditional PID control. The experimental results show that the hybrid calibration algorithm can improve the tracking accuracy and the dynamic performance of the system, and satisfies the “double ten index”, which has certain engineering reference value