Abstract: Though the analysis of underground large-scale extracting technology in Jincheng, Huainan and Huaibei, Songzao mining areas, the technical mode and architecture of underground large-scale extracting coalbed methane are summarized in coal mines of China. According to the relationship research between underground coal mining and gas extraction engineering, it is concluded that the key impact factors of large-scale underground extraction technology are the coal seam permeability, the occurrence condition of coal seam and the seam mining sequence. Critical joint nodes of underground coal mining and gas extraction project are whether or not eliminate the outburst danger of coal seam, whether or not gas extraction meets standard and whether or not gas overrun in upper corner could be avoided. Finally, based on the pattern classification technology research of underground large-scale coalbed methane extraction and space-time connection analysis, combined with the present situation of various coal extraction technologies, we build three types of technical system corresponded to typical extraction patterns, and propose the development direction of underground large-scale extraction technology of coalbed methane．