No.6 mining yard located in the eastern part of Hengjian Mine, as the main mining area of the mine, threatened by Yeqing limestone and the thick h₃ igneous rock confined aquifer. This paper mainly studied on the prevention and control of water technology aimed at h3 igneous rock confined aquifer by constructing advanced test hole, bottom grouting hole and drain hole, testing the effect of the methods of bottom grouting seal and drainage and calculating the safety thickness of water-resisting layer, water inrush coefficient and safety water pressure.