Abstract: The developing characteristic of coal reservoir fractures and the heterogeneity variation factors for No.15 coal reservoir permeability are comprehensively analyzed,based on the actual data of circumferential mine wells in Heshun registration area,Qinshui basin.Combined with effective formation stress variation,it also estimated the reservoir permeability in this area and divided it into four classes.Tract I is considered the optimum area for future exploration,based on above stated study and other parameters for coalbed gas estimation.