This paper introduces the actual situation of the experimental burning of the semi-coke by using a high-rate circulating fluidized bed boiler.Discussion mainly focuses on operation adjustment,boiler energy efficiency and environmental performance,etc..Test result shows that the thermal efficiency of the semi-coke fired high-rate circulating fluidized bed boiler can reach up to 88%~90%;NOx emission concentration is higher than the designed emission limit of the boiler,which should needs to take measures such as SNCR and SCR to meet the requirement for environmental protection;the emission of SO2 is extremely low,thus there is no need to use environmental equipment.After analysis,selecting an appropriate feed particle size distribution and the air excess coefficient are effective measures to improve the efficiency of the semi-coke fired circulating fluidized bed boiler so as to provide suggestive ideas for development and operation of the semi-coke fired boiler.