In this study, the thermal behavior and combustion characteristics of different ranks of coals and their blends were investigated to obtain information necessary for the evaluation of the co-processing of blends with low-rank coals. Thermogravimetric analysis(TGA) and differential thermal analysis(DTA) were carried out at different temperature from ambient temperature to 800℃, and a laboratory-scale pulverized coal combustion burner was used with coal feeing rate of 1.04×10<SUP>-4</SUP> kg/s.