Abstract: The storage and use status of coking coal resources in China were described,the trend of recycling the qualified coking coal from coking middlings and making full use of the existing resources is imperative.The research status on grinding and re-separation status of coking middlings were introduced from the coal quality analysis,the grinding exploring(including the pretreatment)and the separation method.The advantages and disadvantages of different separation methods were compared.Clay minerals are mainly minerals in coal,distributing in the organic components at the particle size of 5 ~ 30 μm mostly.Suitable grinding pretreatment not only promotes dissociation between minerals and organic components in coal,but also is conducive to reduce the ash content.On the condition of low cleaned coal yield relatively,the rough grinding has lots of advantages,including low grinding energy consumption,low reagent consumption,avoiding over grinding effectively,simple process etc.Although the recovery rate of clean coal is little higher by the deep grinding,but it usually leads to huge energy consumption,huge reagent consumption,and other shortcomings.All factors taken into account,the sheet of pretreatment-coarse grinding-coarse flotation and cleaning flotation is considered as one of effective and feasible ways to recycle the coking middlings.