Simple slag without standardized environmental protection measures is an important source of groundwater and soil pollution. Completely removing pollution sources or re-regulating it is a priority plan. However, when unconditionally implementing the above schemes, some places also adopt measures such as physical barrier and extraction-treatment based on field sealing to minimize the impact of slag yards on groundwater environment. Taking a riverside industrial solid waste slag as an example, the Modflow models of in-situ closure, in-situ closure combined hydrodynamic barrier, in-situ closure combined seepage proof and extraction-treatment schemes were established. The numerical simulation results showed that: although the quality of groundwater around the slag would recover in a relatively short time, the pollutants can't be eliminated completely; a well with pumping capacity of 170 m3/d based on in-situ closure also has good control effect, but it has some problems in operation and management;combining curtain grouting and pumping-treatment based on in-situ closure has some comparatively advantages, but the operation management is still difficult. Therefore, the best solution is to completely eliminate the source of pollution or re-regulate the slag, if conditions permit.