Abstract: The adsorption capacity of coal to methane is one of the key factors determining the storage, migration and output of coalbed methane, which in turn affects the transformability, gas generation and storage capacity and gas production effect of coal reservoirs. Taking the coal seam of Shanxi Formation in Hanfeng mining area as the research object, the effects of maceral, moisture and ash content of coal rock and coal structure on the adsorption performance of coal seam were systematically discussed, in order to provide a new geological understanding for the accumulation mechanism and occurrence law of coalbed methane in North China Plain, and provide scientific support for the efficient development of coalbed methane in the eastern foot of Taihang Mountain. The results show that the coalbed methane resources in Hanfeng mining area are rich, and the measured gas content is generally between 8～15 m³/t, which belongs to the relatively rich methane-rich coal seam. The coal seam has a large Langmuir volume but low Langmuir pressure, and has good gas storage capacity and high-efficiency gas adsorption capacity under low pressure. With the increase of coalification degree, the micropore structure of coal gradually develops and the specific surface area increases, thus improving the adsorption capacity of methane. In a certain range of coalification degree, the increase of vitrinite can provide more adsorption sites for methane molecules, while the increase of inertinite will reduce the adsorption capacity of methane. Moisture will reduce the effective site of methane adsorption by physically occupying the pore space. Ash will reduce the overall adsorption capacity of coal samples by reducing the proportion of organic matter in the coal body itself. When the degree of coal damage is more serious, the adsorption capacity of coal is stronger.