Abstract: In order to study the characteristics of coal and rock, hole-fissures, permeability, absorption and other aspects for No.15 coal reservoir in southern Qinshui Basin, its research degree is still low. Combined with the data analysis of coalbed methane well, some methods are used to carry out comparative study for No.15 coal and No.3 coal, such as mineral test, macro and micro observation, mercury, isotherm adsorption test of low temperature liquid nitrogen and so on. The results show that the maceral features of No.15 coal are beneficial to the development of pore-fracture and gas production rate. It has a good adsorption ability and high gas content, the pore-fracture develops well. Some aspects, for example much mineral variety, high content, mineral fills with hole-fissures, can severely reduce the pore structure and permeability. Therefore, the mineral filling, low permeability and poor pore structure are the major factors restricting the coalbed methane development of No.15 coal.