In　order　to　evaluate　the　influences　of　the　axiallyconvergent　contouring　on　the　endwall　film　cooling　performance　of　the　upstream　doublerow　film　holes,　the　cascade　endwall　adiabatic　film　cooling　effectiveness　was　predicted　through　numerical　simulation.The　endwall　thermal　load　distribution,　adiabatic　film　cooling　effectiveness　distribution　and　secondary　flow　field　were　calculated　and　analyzed　for　two　endwall　configurations　(flat　endwall　and　axially　convergent　contoured　endwall)　at　three　different　blowing　ratios　(1.0,　2.5,　3.5)　under　the　simulated　realistic　operation　condition　of　an　industrial　gas　turbine,　inlet　turbulence　of　16%,　exit　Mach　number　of　0.85,　exit　Reynolds　number　of　1.5×106,　based　on　＇two　types　of　thermal　boundaries＇　numerical　method.Simultaneously,　the　secondary　cooling　(phantom　cooling)　phenomenon　of　the　upstream　purge　flow　on　the　vane　surface　was　noticed.Results　showed　that　compared　with　the　flat　endwall　configuration,　the　axiallyconvergent　contoured　endwall　reduced　the　strength　of　the　horseshoe　vortex　and　endwall　thermal　load,　especially　at　the　region　of　vane　suction　surface　shoulder.For　the　axiallyconvergent　contoured　endwall,　the　upstream　coolant　jets　were　more　efficiently　targeted　at　the　endwall,　yielding　higher　endwall　adiabatic　film　cooling　effectiveness,　especially　at　the　regions　of　the　vane　leading　edge　and　vane　pressure　side　where　cooling　was　harder　due　to　the　stronger　secondary　flow.At　the　increasing　blowing　ratio,　the　effects　of　axiallyconvergent　contouring　on　endwall　film　cooling　first　increased　and　then　decreased.The　axiallyconvergent　contouring　resulted　in　a　significant　increase　(up　to　35%)　in　endwall　adiabatic　film　cooling　effectiveness　at　design　blowing　ratio　of　2.5.The　axiallyconvergent　contouring　obviously　increased　the　phantom　cooling　size　around　the　vane　leading　edge　and　pressure　surface,　especially　at　the　region　around　the　vane　leading　edge　(up　to　100%,　0.1　span　at　design　blowing　ratio).This　led　to　an　obvious　reduction　in　the　demand　of　coolant.Therefore,　the　axiallyconvergent　contoured　endwall　is　an　effective　approach　to　increase　the　endwall　adiabatic　film　cooling　effectiveness,　reduce　the　demand　of　coolant　and　realize　the　efficient　endwall　cooling　scheme.　©　2022,　Editorial　Department　of　Journal　of　Aerospace　Power.　All　right　reserved.