Abstract: Based on the data of exploration and development of CBM vertical wells of Fanzhuang and Panzhuang blocks in southern Qinshui basin, the relations among gas content, resource abundance, gas saturation, ratio of critical desorption pressure to reservoir pressure and averaged daily gas production of vertical CBM wells of these two study blocks were obtained by numerical analysis.The results showed that in Fanzhuang, Panzhuang for every single block, without considering the impact of development technology on the production of each vertical well, the gas saturation and ratio of critical desorption pressure to reservoir pressure have greater influence on the production of vertical CBM wells; in the region including Fanzhuang and Panzhuang, the ratio of critical desorption pressure to reservoir pressure made the greatest contribution to the productivity of vertical CBM wells.