Coalmine Goaf Water is one of four major water hazards sources, which is the biggest threat to the safety of coalmines in Sichuan. In order to quickly and accurately identify the Water-Bursting Points of Goaf Water, and reduce the production risk for the coalmine. Based on 14 groups of Surface water and goundwater chemical date form Kongjiagou Coalmine in Sichuan Province, On the basis of groundwater cause and chemical charateristics, Multivariate statistical methods such as correlation analysis and Q-clustering were used to identify the outflow points. The results show that the Piper diagram can preliminary judge the source of mine water. Through setting discriminant value and size relation of Pearson, Spearman and Kendall correlation coefficient, the surface water and deep groundwater has a good recognition effect.Comprehensive use of sampling location, groundwater flow direction, Piper diagram, correlation and cluster analysis can distinguish small differences fissure water and Goaf Water, and improve the accuracy of water source Identification.The research results can provide a reference for water source identification in other similar coal mine water prevention works.