Abstract: To improve efficiency of concentrated cyclone,avoid coarse clean coal pollution by high- ash fine slime,the screen cyclone was used to replace the combination of high frequency sieve and enrichment cyclone in Quandian coal preparation plant. The effects of screen cyclone diameter,size of feeding inlet,diameter of overflow pipe,pressure and concentration of feeding material on mesh cyclone classification effect was studied. The industrial application test of mesh cyclone was conducted. The results indicated that the ash content was19. 78%,the proportion of particle large than 0. 125 mm was 70. 90%,the proportion of coarse particle was large and the concentration was high,all of these made the enrichment cyclone couldn't meet the recovery requirements of coarse coal slime. The effects of feeding material concentration and particle properties on the screen mesh cyclone was studied. The results showed that the classification effects decreased with the increase of material concentration,the slurry viscosity and the content of slime. After transformation,the proportion of particles large than 0. 125 mm in bottom stream was 86. 90%,most of the coarse particle was removed and the ash content was 10. 47%. The ash content of overflow and underflow were 20. 92% and 21. 56% respectively. High ash fine slime was given into floatation system,the particle which was larger than 0. 5 mm accounted for 0. 30%,which was easy to be cycled by flotation machine.