A　promising　new　bond　coat　using　CuAlNiCrFe　high-entropy　alloy　was　proposed　in　this　paper.　The　difference　in　pre-oxidation　conditions　between　the　traditional　thermal-sprayed　MCrAlY　bond　coat　and　CuAlNiCrFe　high-entropy　alloy　bond　coat　deposited　using　high-speed　laser　cladding　was　investigated.　The　result　confirmed　that　the　CuAlNiCrFe　high-entropy　alloy　bond　coat　deposited　using　high-speed　laser　cladding　can　complete　the　pre-oxidation　faster　and　form　a　continuous　α-Al2O3　thermally　grown　oxide　(TGO),　which　shortens　the　initial　oxidation　stage,　thereby　avoiding　the　formation　of　other　oxides　and　spinel　structures.　In　the　subsequent　isothermal　oxidation　process,　the　block-like　structure　of　the　high-speed　laser　cladding　layer　and　the　sluggish　diffusion　effect　of　the　high-entropy　alloy　work　together　to　ensure　the　slow　and　continuous　supply　of　aluminum　element　to　TGO　layer　and　obtain　a　low　growth　rate.　Also,　the　diffusion　between　the　bonding　layer　and　the　substrate　is　controlled　at　a　low　level,　and　the　new　CuAlNiCrFe　bond　coat　exhibits　excellent　oxidation　and　diffusion　resistance.　With　the　consumption　of　aluminum,　the　phase　structure　of　the　high-entropy　alloy　bond　coat　changed　from　BCC　to　FCC,　but　it　still　maintained　a　stable　simple　solid　solution　structure.　©　2020