The electro-hydraulic servo system is an indispensable part in the field of industrial manufacturing,it is a complex time-varying nonlinear system.Conventional PID has the problems of difficult parameter adjustment and low efficiency in practical industrial control,so it is difficult to achieve ideal control results.In view of the above problems,a method of improving the artificial jellyfish search algorithm to optimize the parameters of PID controller was proposed.The concept of random movement in butterfly algorithm was introduced into the artificial jellyfish algorithm,which was compared with PSO algorithm and standard artificial jellyfish search algorithm,and the PID control model was established by using MATLAB software.The simulation results show that the improved artificial jellyfish search algorithm can efficiently,accurately and quickly optimize the parameters of PID controller,and it shows the advantages of good robustness,less adjustment time and relatively stable operation,the control performance of the system is significantly improved.