Abstract: By using one-dimensional atmospheric chemistry model for stratosphere and troposphere, with including the vertical advection, diffusion and chemical processes, the vertical distribution of ozone is studied. It is found that the increase of ozone concentration in lower troposphere is due to increase of surface source of NOx, and its increase in the summer is larger than that in the winter. By comparison the sensitive experiments of diffusive coefficient with vertical wind, it is indicated that the effects of advective process in the ozone transfer from stratosphere toward troposphere may be more important