Abstract: In order to find out the difficult and choke points that restrict the realization of coal washing with less generation of coal slime in coal preparation plants, the problems encountered by all the plants under the Mining Group in coal cleaning, process equipment and management aspects as well as the main potentials that can be tapped are all clearly defined and thoroughly analyzed.Now, an innovative “5+N” coal cleaning system with less generation of coal slime is in application.The system features the use of coarse slime separation and recovery process, coal slime flotation process, coarse flotation tailings recovery process(for use as coal blend), filter press cake product drying and crushing process(for use as coal blend)and lignite dry cleaning process.The system can be flexibly applied in each plant according to propertly of coal treated so as to minimize the output of coal slime and downgrade as much as possible the quality of the slime generated.Application of the “5+N” system has made it possible to obtain an optimal coal washing effect and much improved social and economic benefits.