Coalbed　methane　(CBM)　has　achieved　commercial　production　in　China　over　the　past　decade.　However,　its　single　well　production　rate　is　relatively　low.　This　is　mainly　due　to　the　low　coal　permeability,　which　is　a　critical　property　for　gas　production.　Fanzhuang　block,　southern　Qinshui　Basin,　is　a　main　CBM　production　area　in　China.　The　coals　have　mineral　fillings　in　the　cleat　system　and　the　mineral　fillings　have　significant　impact　on　coal　permeability,　thus　the　production　rate.　In　this　work,　methane　permeabilities　on　two　selected　samples　from　the　Fanzhuang　block　were　measured　from　high　gas　pressure　to　low　gas　pressure,　simulating　the　gas　production　process.　CT　scans　were　performed　on　the　two　samples　and　two　sets　of　fracture　systems　were　observed.　One　set　of　fractures　was　filled　with　minerals,　while　another　set　of　fractures　was　open.　Therefore,　the　impact　of　minerals　filling　on　permeability　and　fracture　compressibility　is　complex.　Moreover,　the　strong　swelling　strain　anisotropy　and　low　Poisson＇s　ratio　are　also　speculated　to　be　closely　related　to　the　mineral　fillings　in　the　fracture　system.