Abstract: In order to optimize an groundwater exploitation plan in central area of Datun Mining Area,to reduce over exploitation of the groundwater affected to the surf ace subsidence and to release the water supply insufficient in the central area,based on the numerical simulation method of the ground water,study on the carrying capacit y of the groundwater resources in the central area was conducted.According to the hydrogeology,meteorological and water resource utilization and other informations,the h ydrogeologic conception model,mathematic model and numerical model were established in sequence.The Visual Modflow was applied to the solution and the water level d ata from the long-term observation well was applied to the identification and verification of model. The results showed that nine over exploitation wells had a water over dra inage value of 192 ~ 480 m3 per day.With a reduction of 20% ~ 50%,the water pressurized mining could be realized in the aquifer,the surface subsidence in the central are a would be released and the water resources could be rationally utlized.