Aimed at electrohydraulic force servo system commonly used in aircraft structure strength test, the composition and mathematical model of the system were introduced. In order to overcome the nonlinear and load disturbances, parameter selfadjusting fuzzy-PID controller was designed through MATLAB. By means of the modeling method of system identification, the prediction error method was used to obtain ARMAX parameter model identification results. The identification results were used as the object to carry out Simulink simulation and analysis on the designed parameter selftuning fuzzy PID controller. The results show that compared with the conventional PID controller, the system has better steadystate accuracy, rapidity and robustness by using the parameter selfadjusting fuzzy-PID controller