Abstract: 3-layer structure aquifer system was simplified to set up 3-D confined unsteady flow model on the basis of analyzing geological and hydro-geological condition of a mine area in Xishan coalfield.Applying Visual Modflow software to calculating the model，water-level dynamic state of Taiyuan limestone and Ordovician limestone Karst fissure water was predicted.Results showed that coal mining made water-level of two aquifers declined.After 2373 days of coal mining，maximum water-level decline of Taiyuan limestone aquifer reached 137m and drainage zone occurred in south of research area，and maximum water-level decline of Ordovician limestone aquifer was 8.1m.Underground water-level decline speed continuously reduced with coal mining time increased.The result had important significance for water resource protection and water control measurement design.