Abstract: In order to further reduce the rate of loss of coal in refuse,a trouble generally found in individual coal preparation plants of Fenxi Mining Group,an investigation is conducted of the schemes for specifically tackling this problem based on the result of analysis of the process equipment used in both raw coal pretreatment and primary washing systems.The investigation is made proceeding from 3 aspects,i.e.coal cleaning process,separating equipment and quality control,so as to provide a material basis for each plant to obtain economical,social and environmental protection benefits through reduction of loss of coal in refuse.