The accurate evaluation and reasonable optimization of coalbed methane geology engineering dessert area is the foundation of formulate detailed exploration and development integration scheme. This paper focus on the Da’ning-Jixian block deep coal No.8, make full use of the study area of coal core description, analysis, test, logging, seismic and dynamic data, through coal No.8 of coalbed methane in the study area all kinds of information system and in-depth analysis, from the coal seam roof and floor lithology, thickness, structure, sedimentary environment and the coal and rock characteristics, etc., systematically has discussed the Lord of the deep coalbed methane enrichment Control factors, and established indexes for evaluating the geological engineering sweet spot, then divided the geological engineering sweet spot in the study area. Research results has shown that the coalbed methane enrichment mainly by roof and floor lithology, structure and characteristics of coal and rock, sedimentary environment"s influence on the coalbed methane enrichment in roof and floor lithologic combination and sealing ability and other characteristics; Evaluation in the study area geology category, engineering type of favorable area of 411.5km2^{, resource of 1038.75} 108^m3^; The favorable area of second class geology and first class engineering is 596.2 km2^{, 1192.4} 108^m3 ^resources; The favorable area of second class geology and second class engineering is 287.4km2^{, and the resource amount is 574.5×10}8^m3^.