[Objective] Taking a solid waste treatment plant in Dagang Area of Zhenjiang New Area in Jiangsu Province as the research object, the groundwater pollution was simulated to provide a reference for the prediction and control of groundwater pollution of similar construction projects and enterprises.[Methods] By systematically analyzing field water level, water quality observation data and hydrogeological conditions of the solid waste treatment plant, the groundwater flow and solute transport model were established by Visual Modflow software.[Results] We simulated the migrations of COD_Mn and NH₃-N characteristic pollutants after seepage damage of the factory sewage treatment station, predicted the barrier effect of surface hardening pollution control measures on pollutants, and predicted the pollutant influenced range, over standard range and maximal migration distance by numerical simulation. It was predicted that after 20 years, the pollutant would have the largest influence range and the farthest migration distance, and the influence range of COD_Mn would be larger than that of NH₃-N, and the migration distance be more than that of NH₃-N. After the surface hardening, the pollution feather would not exceed the scope of this assessment.[Conclusion] The pollutants mainly migrate in the direction of water flow, the impact on water environment increases with time, the pollutant concentration decreases with the increase of migration distance. Different contaminants have different solute transport ranges and migration distances in groundwater aquifers. And surface hardening measures can effectively control the spread of pollutants.