本文建立了描述场址区含水层中ＴＣＡ污染运移的数学模型，采用有限差分法求解．假定场址区水流呈稳定态，而溶质运移呈非稳定态．数值模拟结果表明，持续去污条件下含水层中ＴＣＡ污染羽状体的分布范围及其浓度均有明显的减小，三年之后，其去污效率达８０％以上．因而认为，抽出处理方案于本实例中的应用是成功的．场址污染含水层介质的较强的水力传导性是其主要的有利因素 In this paper, a mathematical model describing the transport of TCA in aquifers at the site has been established and solved by finite difference method. It is assumed that the water flow in the site area is stable and the solute transport is unsteady. The numerical simulation results show that the distribution range and concentration of TCA-contaminated plume in aquifers under continuous decontamination obviously decrease, and the decontamination efficiency reaches more than 80% after three years. Therefore, it is considered that the application of the extraction treatment scheme in this example is successful. The strong hydraulic conductivity of site-contaminated aquifer media is its major beneficial factor