Abstract: The hydrogeological conditions in Xishimen iron mine, which is a mineral deposit filled with karst weter, have been deeply expounded. On the basis of the above expounding, the finite element technique for the three-dimensional flow has been applied to solve she hydrogeological parameters of the mining region and to predict the mine inflow of four levels. These research results may be used as the scientific bases for design of the mine drainage. So far, there are few examples of solving hydrogeological problems with the finite element method for the three-dimensional flow. This research may be one of valuable explorations.