Abstract: Huangyuchuan coal preparation plant,as an appendant project to Huangyuchuan coal mine,is oversize and modern,which is in trial operation phase.To improve its economic benefits,considering the raw coal yield,coal type and normal production time,plan eleven preparation schemes,which are washing No.4 coal alone,washing the mixture of No.4 and No.6 coal.According to the cost calculation,adopt the scheme of preparation of sized blended coal.First blend No.4 coal and No.6 coal by the proportion of 4 ∶6,then screen the blended raw coal with 25 mm screen,wash the screen overflow（200 mm to 25 mm） rather than the screen underflow（25 mm to 0）,the slime is mixed into commercial coal.