The coal quality indexes, granularity and combustion rate of Tun Liu coal, Fu Gu coal and dust of 9# BF in Chang Gang under different proportion are discussed and the aim is to discuss the optimal mixed proportion. The results show that: the dust of 9# BF has upper carbon and calorific value, so it’s fit for injection when mixed with coal. The optimal mixed proportion of Tun Liu coal and the dust is 80%and 20%, Tun Liu coal, the dust and Fu Gu coal optimal mixed proportion is 80%, 10% and 10%.