Abstract: In order to sovle problem of difficulty to obtain optimal control parameters and poor control effect of jig discharging system by use of traditional PID control method, the paper proposed a method of using genetic algorithm to optimize PID control parameters, and introduced PID control structure based on genetic algorithm and parameter optimization method and steps. It also simulated control performance of PID controller based on the method taking jig discharging system of a coal mine as an example. The result showed that the method can online optimize PID control parameters with quick convergence rate and strong robustness, and the PID controller has good static and dynamic performance, high control precision and no overshoot.