Abstract: In order to study the impact of closed mine water on the safe mining of adjacent production mines,with the closed pit of Sanhejian Coal Mine as the engineering background,theoretical analysis and numerical simulation and other methods were used to evaluate the anti-water coal at the boundary of Sanhejian-Yaoqiao Coal Mine from multiple angles.By analyzing the drilling of boreholes and geological structures that the boundary of the minefield may become a water channel,the influence of the closed mine water of Sanhejian Coal Mine on the safety of mining in the west wing of Yaoqiao Mine is studied.The research results show that Yaoqiao Mine has a coal (rock) pillar width of 160 m in plane distance from the F19 fault,which can resist the water pressure along the coal seam caused by the closure of the Sanhejian Coal Mine.The width (Ha) of the safety water-proof coal (rock) pillars before and after water filling meets the safety requirements; the badly sealed boreholes and collapsed pillars are less likely to cause serious water inrush in Yaoqiao Mine; the overall water content of the boundary fault is generally rich and water-conductivity is weak,but there is the possibility of water transfer after the excavation is activated.The analysis believes that the location of the No.7 coal waterproof pillar line planned by Yaoqiao Mine is reasonable,which can realize the safe mining of Yaoqiao west wing mining area,and the research results can provide technical basis for the prevention and control of closed mine water hazards in Yaoqiao Mine and similar conditions.