In the process of lower coal group mining in Wanfeng Mine，Taiyuan group limestone water poured from the roof，floor threatened by Ordovician limestone water, with complex hydrogeological conditions. In order to guarantee the safe mining, through the analysis of mine geological and hydrogeological conditions and the influence of water inflow and water inrush factors of the lower coal group, the main work requirements of water prevention and control technology in the process of the lower coal group was put forward, the importance of advanced detection and grouting reinforcement was emphasized, which has guiding significance for safe production in Wanfeng Mine.