©　2017,　Editorial　Department　of　＂Journal　of　Engineering　for　Thermal　Energy　and　Power＂.　All　right　reserved.　In　this　paper,　the　effect　of　placing　V-shape　step　upstream　of　the　film　cooling　hole　on　the　film　cooling　effectiveness　was　studied.　The　steps　with　five　different　heights　were　selected　to　investigate　the　flow　dynamics　and　cooling　performance.　The　results　indicated　that　placing　V-shape　step　upstream　can　induce　a　pair　of　vortex　which　rotates　in　an　opposite　direction　to　the　kidney-type　vortex.　The　step-induced　vortex　suppresses　the　expansion　of　the　kidney-type　vortex,　and　it　causes　a　reduction　in　separation　of　coolant　jet.　Besides　that,　the　step-induced　vortex　leads　to　the　fact　that　the　coolant　is　closer　to　the　flat　plate　and　the　spanwise　spreading　of　coolant　increases.　The　case　of　placing　V-shape　step　of　h=0.3Dh　upstream　shows　the　most　uniform　spanwise　distribution　of　coolant.　In　addition,　placing　V-shape　step　upstream　causes　an　increase　in　total　pressure　loss,　and　as　h　increases　the　total　pressure　loss　increases.　Additionally,　placing　V-shape　step　upstream　improves　the　cooling　performance　on　the　bottom　wall.　Moreover,　the　cooling　effectiveness　increases　with　h　until　a　maximum　occurs　at　h=0.3　Dh.