Abstract: Through processing the large number of water quality chemical composition test results of three main aquifers,which affect the under-group coal mining at Daizhuang coal mine of Zibo mining group,the water feature model of mainly water filling resource in the under-group coal seam is established.According to the comprehensive comparison between the water feature indexes of a recent water bursting point and the established water feature model,the source of bursting water is determined timely and accurately.