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ECBM (Enhanced Coal Bed Methane) recovery process can be used to reduce greenhouse gas emission through the disposal of anthropogenic carbon dioxide into coal seams [1].The production of methane can be also accelerated with CO2 sequestration since CO2 competitively adsorbs on coals by replacing pre-adsorbed CH4 [2].Therefore,the adsorption behavior knowledge of CO2/CH4 mixture gas o1n coal is necessary for the accurate assessment of ECBM operation.Adsorption equilibrium of CO2/CH4 binary mixture on coal (Kyungdong coal,South Korea) have been measured.The volumetric method was used to measure the isotherms of mixture,coupled with gas chromatographic analysis.