Effect　of　the　slot　jet　impingement　on　the　cooling　performance　of　the　vane　endwall　was　numerically　investigated　using　three-dimensional　Reynolds-averaged　Navier-Stokes　(RANS)　equations　and　k-ω　turbulent　model.　The　film　cooling　effectiveness　of　the　experimental　vane　endwall　was　analyzed　using　four　turbulent　models.　The　accuracy　of　the　utilized　k-ω　turbulent　model　for　the　cooling　performance　of　the　vane　endwall　was　demonstrated　by　comparison　of　the　experimental　data　and　numerical　results　with　four　used　turbulent　models.　The　different　slot　widths,　angles　and　geometrical　profiles,　as　well　as　the　leading　contours　of　the　vane　endwall　were　utilized　to　analyze　their　effects　on　the　cooling　characteristics　of　the　vane　endwall.　The　numerical　results　show　that　slot　width　has　great　influence　on　the　cooling　characteristics　of　downstream　endwall　surface,　and　it　achieves　better　cooling　performance　on　the　downstream　endwall　surface　with　the　decrease　of　slot　width　when　the　slot　flowrate　ranges　within　a　certain　scope.　The　angle　and　structure　between　slot　entrance　and　downstream　endwall　surface　can　significantly　affect　the　cooling　characteristics　of　downstream　surface.　Smaller　angle　of　slot　entrance　and　downstream　endwall　surface　and　smoother　structure　obtain　better　cooling　performance.　The　optimized　slot　downstream　endwall　profile　achieves　better　cooling　performance　compared　with　conventional　endwall　profile　because　the　optimized　slot　downstream　endwall　profile　can　adjust　flow　rate　distribution　via　changing　the　geometry　along　the　pitchwise　orientation.　The　endwall　geometry　profile　with　non-dimensional　amplitude　of　0.75　and　phase　angle　of　30°　achieves　optimal　cooling　performance.　©,　2015,　Xi＇an　Jiaotong　University.　All　right　reserved.