Abstract: In order to realize a scientific rational evaluation on the floor water inrush grade,based on the entropy weight method and the Fuzzy Set pair Analysis Method,a danger evaluation model of floor water inrush was established.Firstly,from the four aspects,of the geological structure,hydro geological conditions,floor isolated layer conditions in the floor and mining conditions,thirteen indexes of the fracture density,fold,fault hydraulic conductivity and others were selected to establish the evaluation index system of the floor water inrush.Secondly,according to the classification of the available conventional floor water inrush grades,the dangers of floor water inrush were divided into 4 grades.Thirdly,with the comparison between the actual value of each index with the first-grade standard,a fuzzy connection degree of each index was calculated.And the information entropy was applied to determine each index and thus the fuzzy connection degree of sample was calculated.Finally,the maximum subordinate degree principle was applied to the evaluation and judgment.The model was applied to five sections of Feicheng Mining Area and the study result showed that based on the theory of Fuzzy Set Pair Analysis,the danger evaluation model of the floor water inrush could have the full same to the evaluation results of the floor water inrush evaluation based on unascertained measure theory as well as the actual situation and could be applied to the evaluation of water inrush danger of floor.