Abstract: In order to solve the problem of the raw coal not effectively classified and feed size beyond the requirement of primary cleaning equipment in Gedian coal preparation plant,the technical reformation has been carried out on raw coal classification system,lump coal system,small coal dense medium system,coarse slime system and flotation system. By the technical reformation and replacement of equipment,the productivity of Gedian coal preparation plant increased sharply,clean coal recovered efficiently,and achieved favorable economic and technical indicators.