Abstract: to solve the problem of high fine particle content and high sulfur content in raw coal in Baiyan coal preparation plant of Chongqing Songzao C＆E Co Ltd,The paper introduced the application of KRL/DD3000×10 flip-flow screen in raw coal dry classification and emphasized on the working principle,structure features,performance and application result of the flip-flow screen,which provided the reference for the raw coal dry classification for large scaled coal preparation plant.