The southern of Yangquan coalfield near Sijiazhuang Mine was observed, and some experiments of mercury injection test was done, anatomically No. 3, 8, 9 and 15 coal reservoir fracture characteristics and pore structure characteristics of Sijiazhuang and other mines in Yangquan were analyzed. The results showed that seam fissures in the area was conducive to the coal seam permeability, micro fracture and plant cells remain big pore is key to coal bed methane desorption and seepage, high permeability value area is located along deep of Nanyu and Baiyangling, low permeability value area locates along Maanshan and Majuntou.