The Pojianghaizi Mine is currently mining the No. 3-1 coal seam. By analyzing the characteristics of the aquifer in the second area, the characteristics of the water barrier, the hydraulic connection between the aquifer and the groundwater replenishment and runoff conditions, the water-filling factors of the mine when mining the coal seam were determined and the mine water influx was predicted. This analysis of mine hydrogeological conditions and water-filling factors provided a reference basis for water damage prevention and control in the mine.