In recent years, the application of regional overtreatment technology formed by the ground level directional drilling technology provided a new solution for the management of water damage of ash karst. At present, most of the regional treatment techniques choose the top of the ash rock layer as the treatment target layer. Xin'an mine as a geological type, hydrogeological type extremely complex mine, complex structure, ash extremely rich in water, the top of the ash as the regional management purpose layer does not meet the actual situation of the mine, after careful analysis of the data, 11216 mining area was taken as the research object, 11216 mining area ground regional management project construction process, the coal seam bottom plate big green tuff was taken as the management purpose layer to prevent the bottom water damage.