The mining of shallow coal resources in North China entered the final stage. More and more mines entered deep mining. The high water pressure, high ground temperature, high ground stress and other geological disasters faced by deep mining were serious, and the treatment methods in shallow mining were taken, but not suitable for deep mining. With the increase of deep mining in the Hanxing area, the threat of high-pressure Ordovician limestone water in the coal seam floor was becoming more and more serious. Xingdong Mine was taken as an example. The mining depth was 1 000 m deep. It was threatened by the Ordovician limestone confined water and the Ordovician limestone fissures and tectonic development. The traditional ground grouting treatment method had large amount of engineering, low efficiency and high cost, which could not keep up with the production of the working face; The slurry treatment was faced with the problem of ultra-high floor water pressure control and had a high safety risk. Therefore, it was necessary to adopt new technical means. Long-distance oriented near-horizontal bedding branch drilling was adopted to carry out grouting and water blocking technology research, improve exploration efficiency and reduce exploration and management costs.