Abstract: Aiming at the characeritc of great oiferences of coalbed methane(CBEM development potential and diffcuity in West Guizhou,this paper atempted toexplore the optimal layer section for CBM commingled development.Eased on the measured data in demonstratio project of CEBM exploration and development in onghe Mine Fiel.,tis paper analyzed the develogment of feld coal reservoir and the CBM resevir foming characterstics and discusd the opimal paramers pinciples and method of CBM commingled development layer section in cal seams developed area of songhe Mine Fied, and coptimized the develcped layersection bythe fozzy comprehensive evaluationon tis basis.The research showed that the CBMl resouce mainlyocured in the multle low perme ablit oal se ans ith thin to mediumthickness ofLongtan coal measures infe d.The geothemal gradient of coal seres manfested was postive anomaly.T he reservoir rssure wa sightly higherand thecalbed gas content and gas saturation both were relative high. Therefore.the study area had a favorable CEM development condion.The analysis results showed thatthe coal group contained No.9-No.12 seam and the coal group contains No.13-N0.16 seam of Longtan coal measures were most favorable lay rsectins for theCBM commingled development.