The flow feedback type electro-hydraulic proportional valve is a more complex high-order nonlinear system,for which the control of traditional PID performs poorly.For the purpose of improving the valve control performance,a set of parameter self-tuning PID algorithm based on fuzzy control theory was proposed.The working principle of the electro-hydraulic proportional valve was analyzed,a two-input and three-output fuzzy self-tuning PID controller was designed; Simulink and SimulationX software were used to establish the fuzzy PID model and the electro-hydraulic proportional valve model respectively,and the control characteristics of the electro-hydraulic proportional valve were simulated and analyzed.The results show that by using the designed fuzzy PID controller,the stability and dynamic performance of the new electro-hydraulic proportional flow directional valve can be effectively improved.