Abstract: Due to the water inrush from a floor of deep seam is an open system continually exchanging with the outside environment on the material, energy and inf ormation and the system with the features of a cooperativity, self-organization, multi maijor control factors and inaccurate conditions, in order to predict the water inrush from the floor of the seam, with the main control index system of the water inrush from floor of deep seam established, there were nine maijor control factors obtained W ith the grey correlation analysis.The entropy function method was applied to determine the contributed weight of the main control factors in the water inrush process. Se ven subordinate functions and two subordinate scales were selected to make the standard processing of the main control factor indexes. Based on the circumstances, a linear grey matter element analysis prediction mode was established.The comprehensive correlative degrees of each predicted samples for five practical samples were obtained and the evaluation results was the same to the actual conditions.With application of-1 and 0 as the threshold values, the safety area, weak area and danger ar ea of the floor water inrush in the deep mine were determined.