Ⅲ3 coal seam of Xuandong Mine located under highway of Gujiaying village and Beijing Zhangjiakou, the recover mining may affect surface building, based on special geological conditions of gentle dip coal seam, deep buried coal seam, covered by thick igneous rock, surface rock displacement, the surface deformation changing law of tick coal seam with gentle dip, large depth and covered by t hick igneous rock was summarized, which provided reference for safe recovery mining of No. 3 mining area.