Abstract: acording to a large coal preparation plant hard to realize an effctive dry screening on the raw cal with a size over 13 mm ,a BFS3080 RDD flip f1ow s:reen was applied to Yangehang Branch of Ningdong Coal Preparation Plant. A lower linit depth ofthelump cal screening was extended from 25 m to 13 mm and theclean coal wth a particle size fron 25 mm to 13 mn cauld be picked up from the fine coal for the coal themical industry Thus those paricle cals could replace the clen medium ump coal with a quantity of 1.42 millin tons per earfor other consumers and the anual economic beneft could be improved withRMB125.3 millins. heresults of the fit fovw screen aplid to Yangchang Branch showed that the applicaion of the ilip fovw scre achieved remarkable effcts oreduce the lower lihit of the screening to improve the screening eficiency.to reduce the maitenance costto reduce the noise and to prevent the dust, to save the energy and others.