Aiming at the needs of aviation industry on the servo valve of high frequency response and high precision, a piezoelectric stack type jet pipe servo valve was designed,and its working principle and dynamic characteristics were analyzed. To further improve its performance,an orthogonal factor analysis was proposed to determine the key parameters and the response surface optimization method. This method was used to determine the optimal structural parameters of the piezoelectric stack type jet pipe servo valve.The simulation results show that the performance of the optimized servo valve is greatly improved.