Abstract: In order to evaluate the risk of water inrush from Ji4 mining area floor limestone in Pingdingshan No.13 coal mine, the entropy weight method and fuzzy analytical hierarchy process (FAHP) are coupled to determine the weights of the factors affecting water inrush and establish a vulnerability index evaluation model. The results show that II1 coal seam floor of Ji4 mining area in the Pingdingshan No.13 coal mine elevation ranging from -150 to -350 m area, is not affected by the floor limestone water, belonging to the security zone; the area belongs to a relatively safe area which is not affected by the fault of the region in the elevation of ranging from -350 to -700 m; the area belongs to water inrush danger zone which is in the elevation of -700 m and below or influenced by faults in the elevation of ranging from -350 to -700 m. Under the condition of limited data on affecting water inrush factors, EW-FAHP can used to determine the weight of factors affecting water inrush.