According to the hydrogeological exploration of lower coal seam with pressure mining and specialized for the ordovician limestone aquifer hydrogeological exploration results in Dongpang Mine, combined with the past relevant hydrogeological data, summarizing lower coal seam with pressure mining water structure characteristics and the regularity of water, No. 9 coal seam Ordovician pressure mining hydrogeologic condition was analyzed and prevention and control of mine water measures were settled, which provided technical support for lower coal seam mining.