Taking the hydrogeologic conditions of Xin'an colliery as the prerequisite in this paper, the Hydrochemical compositions of the water from the main aquifer of the colliery was studied by use of Pipor three-line diagram, Alakin classification and mathematical analysis, the differences of Hydrochemical characteristics of the sources of underground water irruption were determined. This study is of guidance significance for finding out the sources of underground water irruption, and provides a basis for the prevention and control of underground water irruption.