Abstract：Using 1D flow and transport model，the effect of geoenvironmental characteristics of clay soil on landfill liner is evaluated. And the results are used to analyze the effectiveness of the standard of landfill liner. Two types of liner，i. e.，clay liner and single-layer composite liner，are studied. And three index，breakthrough time，leaching rate and leaching contaminant quantity are calculated，respectively. The results show that the type of liner must meet the special needs of field condition in droughty or rainy area. And the composite liner can limit the spread of pollutants more effectively than clay liner in rain-belt of South China. Among all the parameters，the effect of ks on landfill liner is the highest. Thus，it is reasonable to use ks as the design parameter of liner. But the effect of diffusion and adsorption of ion in clay cannot be ignored. And the leaching contaminant quantity adopted as control index is more suitable than breakthrough time.
