Abstract: According to the water inrush value increased problem in North Roadway of Zhouyuanshan Mine caused by the watery season of Baoli Fault, the RFPA- Flow numerical simulation software analyzed and obtained that the vadose value of the fault and the water pressure was in positive proportion relationship and along th e water flow direction, the water pressure and the vadose value both would steadily reduced.With the distance to the fault face increased, the water pressure and the va dose value would be steadily reduced .After the grouting conducted, the main water vadose channels at the fault were sealed, water would only seep from the rock crack S around the fault to fault face and the vadose value would be highly reduced. Before and after the groutingconducted, the site measured water inrush condition of the n orth roadway of Zhouyuanshan Mine and the numerical simulation results were the same .After the double grouting liquids and high pressure curtain grouting technology applied at the mine site, the water permeability of the fault broken zone reached at the project leakage prevention standard of the rock foundation.