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Based on hydro-geological of Qilongcun landfill, the transportation mathematical model of leachat was established. The boundaries conditions and replenishment of model were determined. The leachate COD density and the water level were simulated, and the model was identified, and then the right model was defined. The right model was used to simulate leachate COD density in the interior, exterior, and peripheral of landfill. The results show that the COD densities are not high. The pollution is slight in the interior of landfill and is little in the exterior of landfill. They are proving the overburden on top of landfill and drain around the landfill is right. The max. density on the south of landfill shows it is scientific that the cisterns are building on the south of landfill. The paper shows the remediation scheme is feasible.