Abstract: In this paper, taking Sanshandao Gold Mine as the engineering background, the FLAC^3D numerical software is used to establish the fluid solid coupling numerical model of deep mining, simulates the evolution process of seepage field and plastic zone in ore body and filling body under mining conditions, especially when the stope passes through F₃ fault, and analyzes the risk of water inrush in different mining periods and areas.The test results show that it is far away from the fault (-825 m-1 panel), with the progress of mining activities, the pore water pressure in the panel decreases rapidly, and it also reduces the pore water pressure in adjacent panels and faults to a certain extent.When it is close to the fault (-825 m-2 panel), with the progress of mining activities, the joint fissures in the rock mass continue to extend and communicate with the fault to form a seepage channel, resulting in the rapid increase of pit water inflow and the decrease of pore water pressure in the fault.In the process of on-site mining, when the working face approaches or passes through the fault zone, and it is the time with the greatest risk of water inrush in the mine.Key monitoring should be carried out, and water damage accidents can be prevented by means of grouting.After passing through the fault (-825 m-3 panel), the pore water pressure in the panel is small as a whole, and gradually diffuses and decreases to the filling body of goaf on both sides due to the effect of mining pressure reduction.In addition, with the increase of buried depth, the risk of fault water inrush increases rapidly.