CoCrFeMnNi　high-entropy　alloys　(HEAs)　with　different　N　contents　were　prepared　by　vacuum　levitation　melting　and　then　oxidized　at　700-1000　℃,　the　morphology　and　microstructures　of　those　oxide　layers　were　characterized　by　using　scanning　electron　microscopy　(SEM)　with　energy　dispersive　spectrometer　(EDS)　and　X-ray　diffractometer　(XRD).　The　effects　of　N　addition　on　the　oxidation　behavior　of　the　HEAs　were　investigated.　The　experimental　results　show　that　the　oxide　is　are　mainly　composed　by　Mn2O3　at　700　℃　and　800　℃　and　by　Mn3O4　at　900　℃,　while　Cr2O3　is　dominant　at　1000　℃.　It　is　attributed　to　an　easy　peeling　of　outer　Mn　oxide　layer　and　thus　to　an　exposure　of　the　inner　Cr　oxide　layer　at　1000　℃.　The　CoCrFeMnNiNx　alloys　belong　to　a　level　of　completely　antioxidant　at　700-1000　℃　and　the　oxidation　resistance　of　the　HEAs　can　be　improved　with　an　increase　in　N　content.　©　2017,　Editorial　Office　of　＂Jinshu　Rechuli＂.　All　right　reserved.