Abstract: In order to enable the mines in Ningdong mining area to increase low-grade coal output, the improvement scheme as follows is proposed for making full use of the low-grade coal resources; separation of the low-grade coal through rational blending with good-quality coal and reduction of the amount of refuse getting into washing system. Practice shows that separation of low-grade coal in a rationally blended manner has led to increase of yield of cleaned coal product, reduction of operating cost incurred by external dumping or stockpiling of low-grade coal and environmental pollution, creating, therefore, substantial economic revenues.