Abstract：Leachate transport in landfill is affected by complex geological environment. Based on fluid-solid coupled and solute transportation theory in porous media，multi-field mathematical model has been developed for describing leachate transportation，and the numerical model is given by applying P-R implicit finite difference method. The program is applied to simulate the concentration distribution of leachate in landfill，which has been presented under coupling multi-field effect. Numerical results show the convection effects become significant，especially as time passed. The rate of variation of concentration under stress field effect is lower than without coupling effect. The mainly reason is that a decrease of permeability leads to the mean velocity of the fluid slowed down with the skeleton deformation in porous media. Therefore，coupling the seepage field，stress field and concentration field is very important to study the seepage law of leachate transport. It will provide more reliable evidence for forecasting water quality polluted by leachate in aquifer.
