Abstract: The event of evaluation on the effect of grouting to cut-off of water inrush from the coal seam floor in Longmen Coal Mine was selected, and we designed and carried out three steady flow pumping tests and one water level recovery test in the main well. Then, the characteristics of mine water level change are analyzed, and the parabolic model between water flux and water level is established for calculating the residual mine water flow. The residual water supply from the Cambrian limestone aquifer of different inundated elevation is calculated by using the Q-S model and the method of water storage in mine space respectively, results calculated by using the Q-S model are closer to the actual value.