Coal microfacies are closely related to the gas-bearing properties of coal reservoirs，which determines the sedimentary environment and sedimentary source of coal and directly affects the potential of coalbed methane generation and the occurrence environment. The control effect of coal microfacies on coal reservoir gas-bearing properties was analyzed comprehensively from three aspects：coal seam thickness，coal reservoir physical property and ash yield. The coal microfacies was quantitatively divided to predict the gas production prospect of coal reservoir based on the logging data. In the study area，there are 5 kinds of coal microfacies in 3# coal seam，such as moist forest detained swamp facies，dry forest swamp facies，water-overlying forest living swamp facies，wet herbaceous living marsh facies and dry herbaceous marsh facies. The effective coal reservoir is thicker in moist forest detained swamp facies，dry forest swamp facies and water-covering forest living swamp facies. The physical property of water-overlying forest living swamp facies is relatively good. There are a little ash and gangue in moist forest detained swamp facies and wet herbaceous living marsh facies. The potential of gas generation in moist forest detained swamp facies is great，it is moderate in dry forest swamp facies，water-covering forest living swamp facies and wet herbaceous living marsh facies，and it is poor in dry herbaceous marsh facies. Density，natural gamma and natural potential logging curves can be used effectively to divide the effective thickness of coal seam，the thickness of gangue and characteristic parameters such as ash content，which can be matched to the corresponding coal microfacies according to the statistical law so as to effectively evaluate the gas-bearing property of coal reservoirs.