In order to improve the production of Wannian Mine and reduce the threat of limestone sudden water in the mine, the mining relationship between Wannian Mine and the neighboring Nanluanhe Mine was studied, the characteristics of ash water recharge and the dynamic flow of groundwater within the mine field of Wannian mine were focused, Wannian mine was taken as an independent hydrogeological unit, and confirming that the hydrogeological water-rich conditions of Wannian mine and the surrounding area are " weak outside and strong inside" characteristics. The Nanminghe iron ore mine's evacuation ash water evacuation was adopted to control the Wannian Mine underground ash water evacuation, the iron ore mine as the overall funnel sinking point center of the region was given, which ensured the safety of the Wannian Mine -150 m shallow lower group coal mining. The results showed that after reducing the threat of sudden water of ash water in the mine, the mine output of lower group coal would bring great economic benefits, and also eliminate the waste of resources.