Abstract: The separation process had a series of problems in Tangkou coal preparation plant.The separation capacity couldn’t match with the mining capacity,the raw coal quality was poor and product structure was irrational and the like.Based on the coal quality,product structure,characteristics of three-product pressurized feeding dense medium cyclone,TBS and slime dense medium cyclone,determine the process after transformation.The particle ranging from 50.0 mm to 0.5 mm is separated with pre-desliming two-product pressurized feeding dense-medium cyclone,which is monitored with real-time density-control system.The particle ranging from 0.5 mm to 0.3 mm is separated with three-product pressurized feeding dense medium cyclone.After transformation,the clean coal yield is improved by 3 percent,the coal mixed in gangue is decreased to less than 1 percent.Improve the coal preparation efficiency,products value and products recovery,simplify the slime recovery system,the medium consumption is reduced to less than 1.5 kg / t,by about 30 percent.The workers number of every shift required is decrease by 6.