RANS　(Reynolds-averaged　Navier-Stokes)　equations　combined　with　transition　model　SST　γ-Reθ　are　adopted　to　investigate　the　flow　and　heat　transfer　performance　in　a　gas　turbine　blade　with　trailing　edge　cutback　and　lands.　At　three　inflow　turbulence　intensities,　three　mainstream　Reynolds　numbers　and　three　coolant　ejection　rates,　heat　transfer　coefficient　distributions　and　aerodynamic　loss　in　blade　with　trailing-edge　cutback　and　lands　are　compared　with　those　in　trailing-edge　cutback　blade　without　lands.　With　the　existing　experimental　data,　the　reliability　of　numerical　methods　is　validated　at　a　range　of　operation　conditions.　The　results　show　that,　as　the　inflow　turbulence　intensity　increases,　heat　transfer　coefficients　on　blade　surface　for　the　blade　with　lands　are　gradually　increased.　However,　the　heat　transfer　coefficients　on　trailing　edge　cutback　are　not　sensitive　to　the　variations　of　inflow　turbulence　intensity.　The　energy　loss　coefficient　and　total　pressure　loss　coefficient　in　blade　with　lands　are　both　increased　with　increase　of　inflow　turbulence　intensity.　With　the　same　inflow　turbulence　intensity,　the　aerodynamic　loss　in　blade　is　reduced　with　increasing　the　mainstream　Reynolds　number.　For　the　blade　with　lands,　increasing　the　ejection　rate　has　little　influence　on　the　heat　transfer　coefficient　distributions　on　blade　surface,　but　it　significantly　increases　the　heat　transfer　coefficients　on　the　trailing　edge　cutback.　Compared　with　the　blade　without　lands,　heat　transfer　coefficients　and　pressure　coefficients　on　blade　surface　are　reduced,　while　the　heat　transfer　coefficients　on　the　cutback　surface　are　increased　in　the　blade　with　lands.　Compared　with　the　blade　without　lands,　as　the　Reynolds　number　equals　0.5×106,　1.0×106　and　2.0×106,　the　energy　loss　coefficient　in　blade　with　lands　is　increased　by　3.75%,　5.91%　and　6.75%,　respectively,　whereas　the　total　pressure　loss　coefficient　in　the　blade　with　lands　is　decreased　by　3.4%,　3.37%,　and　2.06%,　respectively.　©　2020,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.