The circulating fludized bed (CFB)boiler which uses anthracite coal by fuel in the D power plant is compared with commercial CFB boiler which uses bituminous coal. According to the high ash content of anthracite coal, the ash was only used by fluidizing materials and B/A ratio of the ash was 0.11, so it was relatively difficult to form a clinker. Particle size distribution of bed materials was very wider than that of other CFB combustor. Particle size distribution of bed materials was 100-400 μm and unburned carbon is almost contained in fly ash and especially concentrated under 100 μm particles. So it is needed to control particles size distribution of coal. The temperature range of dense phase of the D CFB boiler is 850-870℃ and is similar to that of other CFB boilers. Because of low combustion efficiency and post combustion of unburned carbon, the temperature of len phase, cyclone inlet and outlet temperature were higher than these of other CFB boilers. Therefore. low combustion efficiency and post combustion might be considered to design and apply CFB boiler which used anthracite coal.