Abstract: By use of mercury intrusion test and low temperature nitrogen absorption test,the pore characteristic of six main seam’s coal samples from the major coal seamYV-1 well in the Yueliangtian mining area,western Guizhou were studied. The mercury injection test results showed that the pore volume and porosity of all the coal reservoirs are low. The pores are dominanted by adsorption pores, and as to the coal reservoirs in the block could have the micropores and transition pores developed, macropores well developed and mesopores most undeveloped double peak structural porosity features.The different types pore would have similar pore volume content and the mercury injection curves are similar for all coal samples.The seepage-flow pores are always characterized by certain connected and mainly open.The low temperature nitrogen adsorption experiment showed that the specific surface area of all the coal reservoirs are large which might be favorable to gas adsorption and accumulation.However,the adsorption pores are mostly comprised of one closed and airtight pores and ink bottle shape hole so that there are poor connections for adsorption pores,it might not be favorable to the desorption and development of the coalbed methane.