Coal measures sedimentary environment is an important factor affecting the coal bed meth- ane(CBM) reservoir. The Carboniferous Taiyuan Formation and the Permian Shanxi Formation are the main coal-bearing strata in the study area. The analysis showed that the barrier island-lagoon -the tidal-flat and shallow epicontinental sea carbonate platform deposition are mainly faces in Taiyuan Formation. The roof-seam-floor sedimentary assemblage respectively represents the la- goon face, the tidal flat face and the tableland face. Shanxi Formation is shallow water-delta system which is the river controlled. The tool-seam- floor sedimentary assemblage respectively repre- sents the swamp face-swamp face-swamp face or the natural levee face-the swamp face-marsh face. The sedimentary facies of the Shanxi Formation is more beneficial than Taiyuan Formation for the enrichment and preservation of the CBM reservoirs.