Abstract: In order to reveal the accumulation of medium rank coalbed methane (CBM) in Hancheng mining area and using the data of drilling, logging, well testing, coal rock test and production, the conditions and main controlling factors of coalbed methane accumulation in Hancheng mining area are analyzed, based on which the CBM accumulation model is studied. The results show that the CBM accumulation conditions are favorable in Hancheng mining area—the key coal seams are widely distributed in the whole area with the thickness reaching 12 m, CBM content of 6~16 m3/t, relatively high degree of thermal evolution, Ro of 1.91~2.56% and good preservation conditions. The CBM reservoir is mainly controlled by structures, hydrogeological conditions and coal metamorphism. Based on structural morphology, surrounding rock conditions and groundwater dynamic characteristics, the reservoirs in the area can be divided into 5 patterns such as low-angle monocline, nose-like structure, marginal nappe, gentle slope anticline and sealed reverse fault