Abstract: In light of the larger volume of water inflow in Huangling No.2 coal mine, and based on the mine hydrogeological conditions and coal seam occurrence characteristics, each group's aquifer（aquifuge）characteristics is clarified, water-conducting fissure zone height is measured by surface drilling, and maximum water inflow is calculated using the groundwater dynamics' “well method” and “hydrogeological comparison method”.The results show that the water-conducting fissure height of No.2 coal seam is 25.84～92.48 m.The normal pit inflow is 122.03 m³/h, and the maximum pit inflow is 170.84 m³/h, which is nearly consistent with the measured average inflow of 124.77 m³/h in Huangling No.2 coal mine.The comprehensive prevention and control measures of water hazard in the mine are put forward: strengthening active water exploration, dredging water in advance, constructing scientific water plugging and drainage system, and improving the responsibility system of water hazard prevention.