Abstract: Carbon dioxide capture,utilization and storage(CCUS) is an effective technology to reduce greenhouse gas emissions and achieve sustainable development of the global environment. Pressurized oxy-fuel combustion technology is a low-cost CCUS technology.Circulating fluidized bed combustion technology( CFB) is one of the most commercialized clean coal combustion technologies. The pressurized CFB oxy-fuel combustion combines many advantages of pressurized oxy-fuel combustion and CFB combustion,which has a strong industrial application prospect. However,the complex structure,the switching of combustion conditions and the flue gas recirculation lead to the great challenges in the start-up,control and operation of the pressurized CFB oxy-fuel combustion system. At present,most of the researches on pressurized CFB oxy-fuel combustion are in the stage of theoretical modeling,mechanism research and bench-scale test. In order to further explore the start-up and operation methods of pressurized CFB oxy-fuel combustion,the pilot-scale experiment was carried out in a pilot test platform of MW pressurized CFB oxy-fuel combustion by Institute of Engineering Thermophysics,Chinese Academy of Sciences. The stable operation of pressurized oxy-fuel combustion was realized,and a pilot-scale pressurized oxy-fuel combustion operation mode and the variation curves of temperature,pressure,coal feed rate and air volume during start-up and operation were obtained.During the pressurized oxy-fuel combustion,the overall oxygen volume fraction reaches 29%,the operation pressure is 0. 30 MPa,the power is 0.84 MW,and the CO_2 volume fraction of the tail gas reaches 91%,which is benefit to the capture and compression purification of CO_2 product. The main process of the pilot-scale pressurized oxy-fuel combustion operation mode is as follows: start-up stage-atmospheric O_2/N_2 combustion stage-atmospheric oxy-fuel combustion-pressurized oxy-fuel combustion stage,and each stage switches stably.