Abstract: In order to improve the ash and yield of coking coal in Fangezhuang coal mine, according to the differences in the characteristics and plasticity of self-produced coal and preferred foreign coal, on the premise of meet the plasticity index of coking coal, the plasticity index and petrofacies of blending coal were analyzed, the results showed that when the target ash was 11%, blending with same types was best for Mengnanzhuang fat coal, that can improve the yield of self-produced cleaned coal by 7.88%, blending with different types was best for Outer-Mongolia 4 # coal, that can improve the yield of self-produced cleaned coal by 4.90%, the mixed coal meets the index of simple mixed fat coal, the effect was remarkable.