Abstract: In order to realize efficient conversion of methane,thermal diffusion column reactor was used to dehydrogenative coupling of methane.C<SUB<2</SUB< to oily products were observed.Due to the thermal diffusion effect,the direction of flow of methane into the vertically set reactor has a great influence on methane conversion and C<SUB<2</SUB< product's selectivity.It is found that downward flowing results in a higher C<SUB<2</SUB< product's selectivity.At the carbon pyrogen surface temperature of 1?470?K,methane conversion was about 36%,C<SUB<2</SUB< product's selectivity reached 40%,in which the molar percentage of acetylene and ethylene was above 95%.Addition of hydrogen into methane greatly increased the C<SUB<2</SUB< product's selectivity.At the molar ratio of H<SUB<2</SUB</CH<SUB<4</SUB<=1/2,C<SUB<2</SUB< product's selectivity was promoted up to 68.3%,meanwhile methane conversion remained at a high level of 23%.A large amount of hydrogen was produced from the dehydrogenation of methane.At the carbon pyrogen temperature 1?470?K,molar percentage of hydrogen of more than 40% was measured in the effluent gas out of dehydrogenation of downward flowing methane.