Abstract: In order to study hydrological parameters features of the high pressurized (over 3 MPa) aquifer, based on the dewater test results of mine aquifer, a 3D u nderground water simulation software Visual MODFLOW was applied to establish 3D numerical model of water system in Ordovician limestone under the floor of the se am.With the ftting correction of the model, the sensitivity analysis method of the local and overall parameters individually was applied to the sensitivity analysis on the permeability coefficient of the high pressure aquifer, elastic water feeding yield and water head boundary.The results showed that the water head boundary affected to t he dynamic variation of the underground water was obvious and affected to other parameters was less.While the elastic water feeding yield affected to the variation of t he water head, the elastic water feeding yield affected to the dynamic response time of the water was obvious.The overall sensitivity of the parameters would be higher than the sum of the local sensitivity and thus the total sensitivity of the model was too high.