Jet pipe servo valve is widely used in aerospace, aviation, ship and other fields because of its strong anti pollution ability, high sensitivity and moderate failure. The influence of the deformation of the slide valve of the jet pipe servo valve on the performance of the servo valve under different working conditions was introduced, and the mathematical model of the friction of the slide valve was established. ANSYS was used to analyze the deformation of the slide valve of the jet pipe servo valve, and the influence of the deformation of the slide valve on the performance of the servo valve was analyzed with AMESim and was tested under different working conditions.It provides reference for the structure design and friction research of slide valve.