An axisymmetric vector nozzle hydraulic servo system based on fuzzy PID control was designed for the functional requirements of the axisymmetric vector nozzle.The system was modeled and simulated jointly by AMESim and MATLAB/Simulink,and compared with the conventional PID control to analyze the response characteristics of the system and verify the feasibility of the redundant backup function and fault return function of the electro-hydraulic servo valve.The simulation results show that the designed axisymmetric vector nozzle hydraulic servo system has good performance,and the system with fuzzy PID control has better steady-state characteristics,dynamic characteristics and stronger robustness,and the redundant backup function and fault return function of electro-hydraulic servo valve are verified to be practical.