Abstract:The performance requirement to solenoid valves used in aerospace is higher than those used in ordinary industry. The solenoid valves used in aerospace need the characteristics of fast response, small size, light weight, good environmental adaptability, high reliability, long life and so on. Twoposition threeway solenoid valve is a kind of commonly used solenoid valve, which needs to meet the sealing requirements for the upper and lower seat. The initial manufacturing, assembly errors, the extrusion deformation errors of valve ports and the wear of the seats will result in position error of spindle motion. The position error of spindle motion will seriously affect the electromagnetic force and spring force, thus it will affect the dynamic properties and even cause the failure of magnet valves. The dimension chain of a twoposition threeway solenoid valve used in aerospace was analyzed, the analysis chart of error influence was 〖JP3〗designed, the influence of position error of spindle motion was analyzed and the method and measure of error compensation were put forward.