High-entropy　alloys　(HEAs)　hold　promise　for　achieving　excellence　performance　due　to　unconventional　composition　and　structure.　In　this　paper,　the　effect　of　FeCoCrNiAl　HEAs　as　binder　instead　of　Co　on　the　microstructure　of　WC　cemented　carbide　was　investigated.　The　isothermal　oxidation　resistance　of　the　WC-HEAs　cemented　carbides　with　6,10,15　%　was　studies　at　700,　800,　900　and　1000　degrees　C.　The　results　revealed　that　the　microstrcture　of　WC-HEAs　cemented　carbides　was　dense,　and　the　average　grain　sizes　of　WC　decreased　with　the　increase　of　HEAs　binder　content.　The　oxide　layers　containing　WO3,　NiWO4,　and　a　small　amounts　of　MWO4　(M　=　Co,　Cr)　were　formed　after　high-temperature　oxidation　of　WC-HEAs　cemented　carbides,　the　ratio　of　MWO4-to-WO3　in　the　WC-HEAs　oxide　layer　increases　gradually　as　oxidation　temperature　increase.　The　oxide　films　thickness　of　WC-10HEAs　cemented　carbides　became　thinner　than　that　of　WC-10Co　at　900　degrees　C.　The　oxidation　kinetic　curves　also　demonstrated　that　the　oxidation　resistance　of　the　WC-HEAs　cemented　carbides　was　better　than　that　of　WCCo　cemented　carbide　except　that　the　binder　content　was　6　%,　and　the　oxidation　resistance　of　the　WC-HEAs　cemented　carbide　was　superior　to　WC-Co　cemented　carbide,　which　was　attributed　to　the　formation　of　protective　oxides　and　MWO4　tungstate.　(c)　2022　The　Ceramic　Society　of　Japan.　All　rights　reserved.