The methane sorption characteristics of the wal bed is important for the exploration and develop- ing of coalbed methane( CBM)，therefore the adsorption characteristics and influence factors of high-rank coal is conducted by the isothermal adsorption test in Gaojiazhuang area, Qinshui basin. The results show that the main coal reservoirs bare strong capacity to adsorb and accumulate CBM in Gaojiazhuang area， with the Iangmuir volume 26cm³/g and moderate langmuir pressure; between the the 3rd and 15th coal reservoirs, the latter has a better adsorption capacity and more different in the spatial distribution; the coal rank and maceral composition are controlling factors of adsorption capacity for CBM, and the moisture and ash content decrease the adsorb ability for CBM of reservoir to a certain degree