Impingement　cooling　is　an　important　turbine　blades　cooling　technique,　but　it　is　often　not　as　efficient　as　required　due　to　the　deflection　of　downstream　jets　caused　by　crossflow.　In　this　paper,　a　novel　corrugated　target　surface　is　proposed　to　convert　downstream　oblique　impingement　into　orthogonal　impingement　for　higher　heat　transfer.　To　prove　this　design,　the　flow　and　heat　transfer　characteristics　of　impingement　cooling　with　conventional　flat　target　surface　(Baseline　case),　full-corrugated　(FC)　target　surface,　and　semi-corrugated　(SC)　target　surface　are　compared　over　the　jet　Reynolds　number　ranging　from　15,000　to　45,000.　Results　show　that　the　Nusselt　number　of　full-corrugated　target　surface　is　almost　the　same　as　that　of　flat　target　surface　at　the　region　corresponding　to　the　first　five　jets,　but　its　peak　value　and　uniformity　are　significantly　improved　at　the　region　corresponding　to　the　last　four　jets,　especially　under　high　jet　Reynolds　numbers.　In　addition,　with　the　increase　of　corrugation　depth　(H),　the　total　heat　transfer　capacity　and　area-averaged　Nusselt　number　increase,　but　this　comes　at　the　cost　of　increased　friction　loss.　Comprehensively　evaluating　heat　transfer　and　friction　loss,　only　the　FC　with　H　=　0.8D　case　always　has　better　thermal　performance　than　Baseline　case　under　all　computed　conditions,　and　the　maximum　improvement　can　reach　5.8%.　Last　but　not　least,　the　SC　with　H　=　0.8D　case　is　proposed　based　on　the　FC　with　H　=　0.8D　case　to　further　reduce　the　friction　loss,　and　results　show　that　its　thermal　performance　is　improved　significantly　due　to　the　decreased　friction　loss　and　almost　unchanged　heat　transfer.　©　2021　Elsevier　Masson　SAS