Abstract: Based on the complexity of water inrush evaluation for coal seam floor, and on the basis of using the value of structural curvature, water pressure of aquifer, water-richness, the thickness of impermeable layer, the percent of lithology, the depth of diversion fissure zone as the quantified characterization of the water inrush factors, subjective weights obtained by analytic hierarchy process were corrected by entropy weight method. The weighing values of water inrush factors are determined. The anastomosing level of the prediction and the known water inrushing point is about 80% by establishing the exponential weighting model. The results show that the water inrush risk becomes more obvious from east to west; the risk index of the axis of south synclinal area (non-mining area) and northeast wing of Bigezhuang Mine is very high.