In　this　study,　the　SST　turbulence　model　is　used　to　simulate　the　flow　and　heat　transfer　characteristics　of　steam　jet　array　impingement　cooling　in　the　quasi　leading　edge　channel.　The　influence　of　Reynolds　number　(Re　=　10000∼50000),　hole　diameter-to-impingement　spacing　ratio　(d/H　=　0.5∼0.9)　and　hole　spacing-to-impingement　spacing　ratio　(S/H　=　2∼6)　on　flow　and　heat　transfer　performance　is　analyzed　and　the　corresponding　heat　transfer　and　friction　correlations　are　obtained.　The　results　show　that　the　channel　pressure　loss　coefficient　decreases　76%∼79%　and　the　average　Nusselt　number　decreases　45%∼49%　at　different　Reynolds　number　when　d/H　varies　from　0.5　to　0.9.　The　channel　pressure　loss　coefficient　increases　1.64∼1.92　times　and　the　average　Nusselt　number　increases　54%∼64%　at　different　Reynolds　number　when　S/H　increases　from　2　to　6.　Increasing　d/H　and　decreasing　S/H　can　effectively　improve　the　comprehensive　thermodynamic　coefficient　of　steam　jet　impingement　cooling　in　quasi　leading　edge　channel.　The　results　of　this　paper　may　provide　a　reference　for　the　design　of　steam　cooling　structure　of　advanced　gas　turbine　high　temperature　blades　in　the　future.　©　2021,　Science　Press.　All　right　reserved.