Abstract: To cut off the supply channel of surface water to goaf water, dredge goaf water and eliminate the threat of water damage, according to the variation of water inflow in the working face, geophysical exploration and drilling during the working face mining, the Kuche river was the main source of water filling in the goaf. The model of water hydraulic infiltration was established, and the water seepage in water hydraulic seepage recharge mining area can be divided into two stages before and after mining: low seepage solid-liquid coupling before mining and high seepage solid-liquid coupling after mining, curtain grouting is used to cut off the seepage recharge between Kuche river and the weathered fissure water aquifer of A₃ coal seam bedrock. According to the geophysical exploration and drilling results, curtain grouting cuts off the water supply channel of goaf and ensures the safety of mine production.