The accurate parameters of coal seam information and the gas content are obtained in CBM parameter well. Wire-line coring technology has been widely used in CBM well coring because of its simple structure, high drilling efficiency, good coring sample quality and short coring time. This paper mainly introduced the successful application of large-diameter wire-line coring barrel in a CBM parameter well and production well of Hebi. Based on the structure features of the selected coring tool and according to the thick soft coal seam conditions, the reasonable drilling parameters and technical insurance measures were summed up with good effects.