For the purpose of developing mine geothermal energy and utilizing the hot water gushing naturally in mining process, we propose a method of fracturing the hot rock of mine and absorbing the energy of hot rock by cold water based on the fissure seepage characteristics. The conditions of rock cracking stably are found through further derivation of rock cracking mechanics model. The vertical and horizontal fracture pressures are gained according to the analysis of crack pressure under unstable state. The relationships between fissure permeability and static stress are clarified by experiment. We establish the permeability coefficient and seepage model of 3D fissure under 3D stress to know how the stress of rock mass affects the permeability coefficient and seepage.