Abstract: This article has analyzed reasons of low-yield of well group He 6 from CBM content, adsorption ability and permeability. The authors think that the amount of resources is normal, the adsorption capacity is too strong and permeability is too low. Because of strong adsorption ability, desorption pressure is very low. It's difficult to drop the coal pressure after desorption. The pressure dropdown distribution is difficult to extend and limit near the wellbore. Original permeability is low, which leads difficult migration of fluid. Anticline, where the permeability is high, and goaf, where the pressure has dropped, are relatively high yield area.