Abstract: To quantitatively evaluate the information of water inrush through coal floor,and get rules of water inrush,binary logistic regression and classification and regression tree were used to predict water inrush through coal floor.Based on the analysis of water inrush information,a probabilistic predicting model which contained all selected factors was established,a simplified model which contained six main factors was established based on backward stepwise regression method.Rules of coal floor water bursting were found by classification and regression tree method,the result of classification test showed that the classification accuracy of water inrush achieves up to 91.67%.