Abstract: In order to discriminate the water inrush source of the lower coal group first heading face in Daizhuang Coal Mine,depended on the related geological data,and combined with the result of water quality test in diffident times,the correlative analysis method of the grey system theory was used to deal with the data from the heading face water-bursting point and then identify the source by dividing it into single water and mixed water.The result show that the water inrush source is mixed water from the tenth under limestone aquifer and the thirteenth limestone aquifer,and the latter is the main source.Finally,actual water quality type,drilling,monitoring of different regional groundwater levels were applied to check the result,which verified the reliability of this method in discriminating water-bursting source.