Abstract: Characteristic of high-water expansive material and its application effect was introduced in this paper.Applying key strata theory,strip stowing mining project was put forward and related parameters including stowing pace,stowing and pillar width were designed on the basis of geological and technical condition of 5th mining area in Wangzhuang Colliery.3 projects in which area stowing ratio was respectively 52%,62% and 73% were calculated by surface movement calculation software.Results showed that surface subsidence of 3 projects was controlled below 200mm and horizontal deformation was controlled below 1mm/m.Applying high-water expansive material to stowing strip could effectively control surface movement and deformation so as to protect surface buildings.