摘要：A s.percritical CO2 gas.turbine cycle can produce power at high efficiency and the gas.turbine is.compact compared with the s.eam turbine. Therefore, it is.very advantageous.power cycle for the medium temperature range les. than 650 ℃. The purpos. of this.paper is.to s.ow how it can be effectively applied not only to the nuclear power but als. to the fos.il fired power plant. A des.gn of 300 MWe plant has.been carried out, where thermal energy of flue gas.leaving a CO2 heater is.utilized effectively by means.of economizer and a high cycle thermal efficiency of 43.4 % has.been achieved. s.nce the temperature and the pres.ure difference of the CO2 heater are very high, the s.ructural des.gn becomes.very difficult. It is.revealed that this.problem can be effectively s.lved by introducing a double expans.on turbine cycle. The component des.gns.of the CO2 heater, the economizer, s.percritical CO2 turbines. compres.ors.and the recuperators.are given and it is.s.own that thes. components.have good performances.and compact s.zes.