Abstract: The difficulty degree of coal seam water infusion is the important basis of determining coal seam water infusion ways, by fully analyzing influence factors of difficulty degree of coal seam water infusion, the main factors of influencing difficulty degree of coal seam water infusion was determined and the fuzzy clustering analysis model was built based on the burying depth of the coal seam, crack development degree, porosity, moist edge, water saturation value-added and consistent coefficient. By comparing evaluation result of this model with Fisher discrimination result and the actual situation of coal seam water injection, the model result is accuracy and reliability. According to this model to predict South decurrent 18 layer 7 working face coal seam of Shuangyashan Mining Group Dongrong No.2 Coal Mine, the predicted results are consistent with the actual situation.