Abstract: The paper detailed introduced the composition,operation process,technical index and characteristics of fine clean coal drying system in Yidong coal preparation plant of Yidong group in Inner Mongolia autonomous region.The operation result shows that the system obtained better drying effect,the moisture of fine clean coal decreased from 28% to 16.5%,and the calorie value increased from 18.817MJ/kg to 20.908MJ/kg after drying by this system,and the process capacity is reaching and more than the design requirement.