Jiulong Mine with large mine depth and large pressure water, influenced by baseboard limestone aquifer pressure, many water burst accidents happened. Based on this problem, combined with Jiulong Mine actual situation, south wing 15248 working face was used coal floor grouting reinforcement process. After the process reforming practice, 15248 working face was without flood hazard, floor water pressure met the needs, the working face was going to end its recovery mining, which provided reference and experience for similar mines.