Mine water disaster has always been a seriously hidden danger of the coal mine production. Therefore, accurately predicting and evaluating has important theoretical significance and practical value.In this paper, according to the characteristics that the relationship among various influencing factors of coal floor water irruption is grey and nonlinear, establishing the coal floor water irruption evaluation index system and grading standards integrating the quantitative and qualitative indicators. At the same time, combining grey relational analysis method (GRA) and fuzzy analytic hierarchy process(FAHP) , coal floor water irruption risk assessment model is set up, which can truly reflect the grey relationship and nonlinear relationship among influence factors. Then, applying it to evaluate water irruption risk grading in a typical working face.This method can provide reference and basis for the research on predicting and evaluating the coal floor water irruption in the future.