Abstract: According to the measurement results of coalbed methane gas content and component, under the distribution and variation regular research of gas content and component in transverse and vertical, affecting factors of coalbed methane gas content had been analyzed by means of vitrinite reflectance, coal seam depth, geothermal gradient, coal-rock macerals,and so on. It is concluded that the depth, coal rank and coal-rock macerals are dominant affecting factors of coalbed methane gas content. The coalbed methane gas content of Hedong and Hexi coal mine is insufficiency to meet the development needed, in the same time, it also can't affect to the development of coal itself, cause of lower depth and coal metamorphic stage, higher vitrinite content in coal-rock macerals.