Abstract: In order to meet requirement of surge irrigation in the tractor ploughing terraces on the hilly mountainous area for reversing valves，a reversing valve with a cuboid three-way valve body and a umbrella valve supported by a curved pendulum was designed，by combination of siphon principle with lever principle.The results of test showed that maximum resistance of this reversing valve was occurred during the valve opening period.The biggest resistance moment could be reduced by lengthening valve rod，shortening distance from pin shaft to active spindle or improving elasticity coefficient of seal ring materials.It can be concluded that the three way reversing valve with a curved pendulum is easy to satisfy requirement of surge irrigation in the hilly mountain areas for its small resistance and convenience to move.