Channel　with　pin　fin　arrays　is　often　used　in　the　internal　cooling　of　the　trailing　edge　of　the　turbine　blade.　Most　researches　on　the　internal　cooling　characteristics　are　carried　out　experimentally　or　numerically　at　conditions　of　atmospheric　air　inlet　and　low　heat　load　(defined　as　the　ratio　of　isothermal　wall　temperature　to　the　cooling　air　inlet　temperature)　on　the　channel　wall.　However,　the　cooling　conditions　for　the　actual　turbine　blade　are　at　high　air　inlet　temperature/pressure　and　high　heat　load.　To　understand　the　effects　of　the　air　inlet　and　heat　load　conditions　on　the　cooling　performance　of　channels　with　pin　fin　arrays,　a　CFD　numerical　simulation　study　was　carried　out　through　FLUENT.　The　numerical　results　show　that　with　the　increase　of　heat　load　on　the　channel　wall,　the　heat　transfer　performance　in　the　channel　decreases　and　the　friction　factor　in　the　channel　increases.　In　comparison　with　the　atmospheric　air　inlet　conditions,　high　air　inlet　temperature/pressure　conditions　cause　the　decrease　in　the　heat　transfer　capacity　of　the　channel,　and　the　decrease　is　more　significant　at　high　heat　load　conditions.　While　the　air　inlet　condition　has　little　influence　on　friction　factor　of　the　channel.　With　the　increase　of　air　inlet　Reynolds　number　(Re),　the　Nusselt　number　(Nu)　number　in　the　cooling　channel　at　high　air　inlet　temperature/pressure　and　high　heat　load　conditions　decreases　more　in　comparison　with　that　at　atmospheric　air　inlet　temperature/pressure　and　low　heat　load　conditions.　This　decrease　should　be　considered　in　the　design　the　internal　cooling　structure　of　actual　turbine　blades.　©　2021　32nd　Congress　of　the　International　Council　of　the　Aeronautical　Sciences,　ICAS　2021.　All　rights　reserved.