The hydraulic jack in daily life normally used, in the use of hydraulic jack operation, it is very important to choose the suitable tonnage load must not be overloaded, generally choose the top 1.2 times is required to load gravity; hydraulic jack minimum height is appropriate, to facilitate the removal, the minimum height selection of hydraulic jack should be. With the heavy force at the bottom of the adaptation, the sleeper support heavy landing process, hydraulic jack lifting height is greater than the thickness of the sleeper and the sleeper and deformation (hydraulic jack).