The multivariate correlative analysis of the grey system theory was applied to deal with the data of the main ion contents of the multivariate water outlets in the Niuxi mine.The result shows that the correlation degree is relatively high between the permeable water sample and the river water sample of Sanggan river.And according to the consequence of the geophysical prospecting,there is a flow migration channel from the south to the north,which is about 150 meters under the ground of the north bank of Sanggan river.It is almost certain that the water source of roof aquifer in 9370 working face in Southwing is from the river of Sanggan,which supplies the andesite aquifer of Tiaoji Mountain Group,and penetrates into the working face along the roof fracture zone after the mining.