Abstract: The permeability of coalbed methane reservoirs is one of the key parameters of coalbed methane exploitation and production．Based on the deep analysis of the latest research results of the desorption process of coalbed methane and the pore characteristics of coal reservoirs，systematical analysis was made in this paper on the main influence factors related to the permeability of coalbed methane reservoirs，it was found that the discharge of a large amount of water would form a large number of pores connected with fractures，which would have an important influence on the permeability of coalbed methane; the maturity of coal seam not only affected the pore structure of coalbed methane reservoirs，but also the pore surface roughness; the influence of Klinkenberg effect on the permeability of coalbed methane reservoirs could be neglected; the solubility of methane showed a trend of first increase and then decrease with the increase of the inorganic ion content．