In order to solve the second-order simplified model of servo system, the feedback controller of the servo system is designed by using the traditional PID control method. Based on this, in order to realize the better adjustment of PID parameters, the fuzzy rules of PID parameters with error and error derivative are established, and the rule matrix is established to realize the fuzzy adjustment of PID parameters. At last, through the detailed numerical simulation analysis, the correctness of the proposed scheme is verified.