Abstract: Preparation of granular activated carbon (GAC) by phosphoric acid activation from fir wood powder were analyzed without any other binder. The activation process,pore structure and methane adsorption of the synthesized GAC were also tested.The results showed that with activation temperature increasing,the adsorption capability of the GAC rose first and fell later, the abrasion strength was steadily improved and the optimum temperature was 450℃. With increasing of impregnation ratio,the adsorption capability of the GAC increased,however the abrasion strength decreased.The analysis of nitrogen adsorption isotherm and mercury injection method showed that the GAC possessed a large number of micropore,mesopore and macropore. The increase of impregnation ratio was favorable for the increase of pore volume, but the bulk density and apparent density decreased.The methane adsorption value of the unit mass and the unit volume of the GAC reached the maximum 125.6 mL/g and 115.2 L/L with the impregnation ratio of 1.25, activation temperature 450℃ and pressure 3.4 MPa.