摘要：A supercrit.cal CO2 gas t.rbine cycle can produce power at.high efficiency and t.e gas t.rbine is compact.compared wit. t.e st.am t.rbine. t.erefore, it.is very advant.geous power cycle for t.e medium t.mperat.re range less t.an 650 ℃. t.e purpose of t.is paper is t. show how it.can be effect.vely applied not.only t. t.e nuclear power but.also t. t.e fossil fired power plant. A design of 300 MWe plant.has been carried out. where t.ermal energy of flue gas leaving a CO2 heat.r is ut.lized effect.vely by means of economizer and a high cycle t.ermal efficiency of 43.4 % has been achieved. Since t.e t.mperat.re and t.e pressure difference of t.e CO2 heat.r are very high, t.e st.uct.ral design becomes very difficult. It.is revealed t.at.t.is problem can be effect.vely solved by int.oducing a double expansion t.rbine cycle. t.e component.designs of t.e CO2 heat.r, t.e economizer, supercrit.cal CO2 t.rbines, compressors and t.e recuperat.rs are given and it.is shown t.at.t.ese component. have good performances and compact.sizes.