The north of groundwater of the Longwangmiao mine was studied as the research object. The hydrogeological characteristics of the mine are analyzed by sorting out the basic data of the mining area. The groundwater flow field model has been established by using GMS software. The simulation results show that the groundwater level is high in the north and low in the south, while the water level in the southeast is lowest. The groundwater mainly flows from the northern part of the mining area to the Southeast. The north receives rainfall supplies and seeps into the depths, and the vertical velocity of shallow layer is larger than that of deep layer. The deep groundwater in north run off to the south of mine, and then evaporated. The simulation results are basically consistent with the actual groundwater runoff characteristics. So the simulation parameters are reasonable and reliable