Abstract: In order to evaluate the danger and harm of the water inrush occurred from the seam floor in a water pressurized mining face, the conception model and the mathematic model of the four attributes danger were provided.The four attributes indexes were calculated.The Occurrence could be described with water inrush nu mbers, water inrush quantity and other index.The Potential could be stated with aquifer, water isolated layer, structure and other related index.The Danger meant the po ssibility of the water inrush from the seam floor occurred under the failure development zone of the surrounding rock, rising development and other induced factors.The Harm would be the harm degrees of the floor water disaster.The results showed that based on the progressive analysis and study process, the evaluation on the water i nrush danger of the seam floor was feasible and practicable.