Abstract: In order to provide technical parameters to prepare the carbon molecular sieve applied to CH4/N2 separation, the paper investigated carbon temperature s of 450, 500, 550, 600 and 650。C affected to the performance of the carbon molecular sieve applied to the CH4/N2 separation. The results showed that the adsorption volume and the balanced separation coefficient both would be increased with the carbon deposition temperature increased and then would be decreased in tendency.W hen the deposition temperature was at 550。C, the performance of the carbon molecular sieve would be optimum, the max adsorption volume of CH4 was 1.41 mmol/g a nd the balanced separation coefficient of CH4/N2 was 4.74.The adsorption/desorption isotherm of nitrogen showed that the carbon molecular sieve sample prepared un der the such conditions was micropore mainly.