The No.3 and No.15 seams of CBM census area were studied from Gaojiazhuang mine in Zuoquan area.We discuss the growth characteristic of coal seams and the variation of the rank,further analyzes the gas-bearing and reservoir characteristics.And the results show that geological conditions of coal-bearing strata are simple,and minable coal seams are featured by big thickness and relatively stable distribution.Besides,the No.3 and No.15 seams belong to lean coal-anthracite coal,which is characterized by high metamorphic degree,coal metamorphic degree of coal gradually increased with the decrease of coal layer from top to bottom,gas content is large and adsorption capacity is high.The main reservoir parameter value of coal is higher,such as gas content,permeability,etc.Gas saturation of seams is close to saturation.