Abstract: Composite liners(a geomembrane in intimate contact with a mineral liner) have been frequently used in landfills.Molecular diffusion is the predominant mechanism controlling volatile organic compounds transport within the composite liner.An analytical solution for one dimensional diffusion of VOCs through composite liners was presented.The results obtained by the solution presented here agreed well with the results obtained by the numerical methods previously published in the literature.Based on this solution,three different composite liners were compared.As for toluene,it was shown that the cumulative mass discharged from the GCL composite liner was several orders of magnitude greater than that from composite liners having a thicker soil liner.