Abstract: To improve the capacity of tailings recovery system in Dongqu coal preparation plant,and increase the recovery percent of tailings,through analysis of coarse coal slime recovery equipment and technologis at present as well as the practical tailings recovery system in Dongqu coal preparation plant,the modification plan on this system is determined. The application shows that DZSN2431 three masses high frequency screen can not only raises the capacity of tailings recovery system and recovery,but also reduce ash of product greatly,which brings remarkable economic benefits.