In order to improve the stiffness characteristics and dynamic performance of the linear motor servo system, to reduce the tracking output error， the control effect of high precision and high speed of the motor is realized. The control response characteristics of linear motor feed system were studied. The transfer function model of the system was established, and the influence of the servo parameters on the response characteristic was analyzed. The position output of the motor was controlled by the proportional integral derivertive (PID) controller to reduce the output error of the motor position. The system modeling and simulation analysis were carried out by Matlab/Simulink, and the control parameters were selected by genetic algorithm, which improved dynamic response characteristics of the system, and has achieved good control effect.