Abstract: In order to protect the scarce coking coal resources and maximize recovery of coking coal, methods of improving quality and efficiency is presented through the status analysis of the coal preparation method, process, product structure and equipment and facilities of different coking coal preparation plants in different regions. It is proposed to improve the yield of clean coal and medium coal by the re-separation of medium coal and the deep flotation process of coal slime. The new dehydration equipment is used which strengthen the desliming and ash reduction of coarse coal slime, and improve the product quality of fine coal slime by dehydration. Realization of intelligent coal preparation plant is helpful to achieve the maximum yield and the lowest cost for coking coal preparation plant. It realized the annual net profit of 81.35 million yuan after middling scrushing and dissociation which low ash clean coal and middlings are recovered by heavy medium and flotation at the first coal preparation plant. It increased profits 26.275 million yuan a year by three flotations for the thickener bottom flows, which coal slime changed into middling by 0.6% and changed into cleaned coal by 0.9% at the second coal preparation plant. The application effects of dehydration of coarse clean coal slime by multi-stack high-frequency screen, dehydration of fine coal slime by high-pressure filter press and intelligent transformation of production process system are analyzed for example heavy medium system, concentration system, pressure filtration system one by one. The economic and environmental benefits of coal preparation plant are remarkable, which has extensive promotion value.