In view of the cleanability of raw feel coal in Wangfenggang Coal Preparation Plant ,the market requirements on coal and the difficulties facing the former system of this plant, the dense medium cleaning system and the dewatering system of forthed coal were respectively reformed by use of "the technology and equipments of large, high efficient and simplified full dense medium coal cleaning flow" and pressure filtration technique, so that the quality of coal product was controlled to meet the specification, meanwhile the medium and energy consumptions were reduced .