To　improve　the　corrosion　resistance　of　heat-resistant　materials　in　high-temperature　CO2,　such　heat-resistant　materials　as　Sanicro　25,　HR6W,　HR230　and　740H　are　pre-oxidized　for　a　short　period　in　high-temperature　O2　and　then　tested　for　their　corrosion　resistance.　An　analytical　balance　is　used　to　measure　the　mass　of　the　heat-resistant　materials　before　and　after　the　test.　X-ray　diffractometer,　scanning　electron　microscope　and　energy　dispersive　analyzer　are　used　to　characterize　the　morphology,　composition　and　distribution　of　corrosion　products.　The　test　results　show　that　the　corrosion　kinetics　curves　of　the　pre-oxidized　heat-resistant　materials　in　900　CO2　conform　to　the　parabolic　law;　the　surface　oxides　of　the　four　heat-resistant　materials　after　pre-oxidation　are　mainly　Cr　oxides　and　a　small　amount　of　sporadic　Fe　oxides,　the　Cr-rich　oxide　film　effectively　reduces　the　ion　diffusion　during　the　corrosion　process,　thereby　reducing　the　corrosion　weight　gain　of　these　materials.　The　corrosion　layer　on　the　surface　of　Sanicro　25　and　HR6W　is　thinned,　while　the　oxidation　in　740H　is　intensified.　It　can　be　seen　from　their　mass　changes　and　corrosion　products　that　high-temperature　pre-oxidation　can　improve　the　corrosion　resistance　of　HR6W　and　HR230　in　high-temperature　CO2.　©　2022,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.