In order to overcome the shortcomings of AHP subjective right, at the same time to avoid the error of entropy objective affirmation inconsistent with the actual importance degree of the major controlling factors, the risk assessment of water inrush from Ordovician limestone floor of seam No.3 in Sanyuan mine, Changzhi was taken as example, the entropy weight and the analytic hierarchy process were coupled to determine the weight of the major controlling factors of water inrush from seam floor and to set up the vulnerability index model, K mean clustering method was used to conduct cluster partition of the vulnerability index value, three threshold values were determined. According to the degree of water inrush danger, the study area was divided into 4 zones: safe zone, the relatively safe zone, the transitional zone and the dangerous zone. Comparative verification proved that the evalua-tion results were consistent with the actual situation.%为克服层次分析法主观确权的弊端,同时避免熵权客观确权与主控因素实际重要程度相悖的错误,以山西长治三元煤矿3号煤层底板奥灰突水危险性评价为例,将熵权与层次分析耦合确定煤层底板突水主控因素权重并建立脆弱性指数模型,采用K均值聚类法对脆弱性指数值进行聚类分区,确定阈值3个,按照突水危险程度将研究区分为安全区、相对安全区、过渡区和危险区4个区域.经对比验证评价结果符合实际情况.
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