Abstract: In this paper, Using the Galerkin method, the study is made, which is about the Inflence of axial dispersion on the elution profile and retention time t_R in nonlinear chromatography, The results show that when the diffusion coefficient D increases, the elution curve changes from "shock type" to "Gauss type", and the rate of chang of t_R due to D from positive to negative.

Key words: nonlinear, chromatography, shock, finite element, diffusion