Abstract: In order to find out the laws of methane adsorption by different types of coal, the adsorption potential theory is used to calculate the amount of methane adsorption of coal under different temperature and obtain the adsorption characteristic curve and difference. The results show that as the failure type of coal increases, the pore capacity increases at all stages, which increases the space for coal to absorb gas; under the same temperature, the greater coal of different destructive types, the greater the adsorption amount and adsorption potential of coal; the adsorption potential of coal decreases with the increase of adsorption space; the adsorption characteristic curve of ε-ω was independent of temperature, and the adsorption potential ε and adsorption space ω meet the function of ε=aω³+bω²+cω+d, in the formula, a, b, c and d are constants.