Abstract: The quality of mineral and the original recovery technology of thin sediment in Dajiang and Dalongshan Mineral Processing Plants are analyzed.Some suggestions are put forward to improve the recovery technology of fine sediment, and it is proved that the improvement is successful.In Dajiang Mineral Processing Plant, the recoveries of tungsten and tin are raised 25.42% and 26.67% respectively.In Dalongshan Mineral Processing Plant, the recoveries of tungsten and molybdenum are raised 16.43% and 2.21% respectively, the economic benefit is raised greatly.