Abstract: In order to deal with the compound interference in the control of jig air valve opening and improve the separation stability and efficiency, a PID fuzzy compound control of jig air valve opening under the compound interference is proposed. Firstly, based on the jig principle model and knowledge rules, the influence of air valve parameters on key indicators such as bed looseness is analyzed, and the control target is established; Secondly, the PID controller is designed to realize the basic feedback regulation, and the fuzzy controller is constructed to dynamically adjust the PID parameters according to the deviation and change rate, so as to enhance the robustness of the system; Finally, the improved genetic algorithm is introduced to optimize the PID fuzzy composite control parameters to improve the control performance. The experimental results show that the proposed method has good dynamic response performance and anti-interference ability, can quickly and stably track the input changes, reduce the overshoot, and improve the sorting accuracy.