After more than 40 years of mining in the Sunzhuang Mine, the upper coal seam has been depleted, and only part of the coal reserves in the deep mountain green coal was threatened by the water of the underlying Daqing limestone aquifer and the Ordovician limestone aquifer. In order to solve the problem of water damage on the floor of the Sunzhuang Mine, directional horizontal drilling was carried out on the ground, grouting reinforcement was applied to the large blue limestone with an average thickness of 5.5 m, and the large limestone aquifer was transformed into a weak aquifer or aquifer and increase the thickness of the water-proof layer on the floor of the mountain green coal seam on the 661 working face. After the completion of the drilling on the ground, the water content of the large limestone aquifer was changed from 15 to 138 m3 / h before the treatment to the grouting treatment. The latter 0.6 ～ 8.1 m3 / h indicated that the treatment effect of the large limestone aquifer was obvious, and it provided experience and technical support for the liberation of shallow buried deep and thin aquifers threatened by water damage.