The　temperature　of　SCO2　fed　to　the　boiler　in　SCO2　coalfired　power　plants　is　relatively　high,　∼500　°C.　It　leads　to　high　boiler　exhaust　temperature,　which　is　∼120　°C　according　to　previous　studies.　Waste　heat　recovery　from　low　temperature　fluegas　in　SCO2　coal-fired　power　plants　is　a　key　issue　to　be　addressed　to　enhance　power　plant　efficiency　and　electrostatic　precipitator　performance.　Therefore,　systems　of　waste　heat　recovery　from　low-temperature　fluegas　were　proposed　in　this　study.　To　evaluate　the　economic　performances　of　the　proposed　systems　and　obtain　the　best　system　configurations,　economic　and　thermodynamic　models　were　developed.　Moreover,　multiparameter　optimization　model　based　on　Genetic　Algorithm　was　developed.　The　waste　heat　recovery　system　is　proposed　and　optimized　by　considering　coupling　and　matching　of　the　air　preheating　process,　heat　regenerative　process　and　fluegas　cooling　process.　With　a　1000MW　SCO2　coal-fired　power　plant　as　the　reference　case,　thermodynamic　and　economic　analyses　were　carried　out.　Results　show　that　when　the　low　temperature　economizer　is　integrated　together　with　the　main　compressor　intercooling　and　flue　bypass　ahead　the　air-preheater,　the　temperature　of　exhaust　fluegas　can　be　decreased　to　∼95　°C　and　the　power　plant　efficiency　can　be　enhanced　by　1.39%-pts　compared　with　basic　system.　Through　the　economic　model　analysis,　the　system　levelized　cost　of　electricity　is　0.04158　$　kW-1　h-1.　Copyright　©　2020　ASME.