Abstract: After the occurrence of water inrush accident in coal mine，it is of great significance to identify water inrush source for formulating rescue plan.In order to quickly realize water inrush source iden⁃ tification，20 groups of water sample data collected in Xuzhuang Mine history were selected，and their Ca²⁺， Mg²⁺，SO4^2- and other conventional ions were divided into four groups，A，B，C，and D based on cluster analysis and concentration difference analysis.And it is determined that they are derived from L4 limestone aquifer of Taiyuan Formation，sandstone aquifer of Lower Shihezi Formation and sandstone aquifer of No.7 coal roof .Using the ion concentration range of each aquifer as the database，the ion library partition based on Piper diagram was plotted.In order to further verify the accuracy of ion library partition map，the water in⁃ rush process of working face 7331 of the mine was analyzed.By analyzing the position changes of water sam⁃ ples at different time points in ion bank partition diagram，it is confirmed that there is dynamic transforma⁃ tion of water inrush source in the process of water inrush.Based on the ion conservation，it is calculated that the water proportion of sandstone in No.7 coal roof is 26.96% and that of sandstone in Upper Shihezi is 73.04% in the mixed water inrush source.It is basically consistent with the actual observation that the water proportion of No.7 coal roof sandstone is 20%~25% and that of upper stone box sandstone is 75%~80% in water inrush source.

Key words: partition of ion bank, cluster analyses, dynamic conversion of water source, ion of conser? vation, water source discrimination