The　FeCrxCoNiB　(x　values　in　molar　ration,　x　=　0.5–3)　high-entropy　alloys　coatings　were　prepared　by　laser　cladding　on　an　AISI　1045　steel　substrate.　Annealing　and　high　temperature　oxidation　experiments　were　performed　on　the　FeCrxCoNiB　(x　=　0.5–3)　coatings　at　900　°C.　The　phase　structure,　morphology,　and　composition　of　the　coatings　and　oxidation　layers　were　analyzed　by　XRD,　TEM,　SEM,　and　EDS.　Results　demonstrated　that　the　FeCrxCoNiB　coatings　are　composed　of　simple　face-centred　cubic　(FCC)　phase　and　boride.　The　hardness　value　of　the　coatings　is　significantly　improved　due　to　the　boride,　which　is　achieved　860　HV　at　x　=　0.5.　Cr　is　conducive　to　inhibiting　the　coarsening　of　boride　and　enhancing　the　resistance　of　coatings　to　high-temperature　softening.　The　oxidation　kinetics　curve　of　FeCrxCoNiB　coatings　basically　follows　oxidation　dynamic　the　parabolic　law.　The　selective　oxidation　in　the　FeCrxCoNiB　coatings　changed　from　the　oxidation　of　Fe　to　the　oxidation　of　Cr　as　an　increase　in　Cr　content,　and　finally　formed　continuous　Cr2O3　film.　The　high　temperature　oxidation　resistance　of　the　FeCrxCoNiB　coatings　dropped　with　adding　boron　into　the　coatings,　which　improved　contributing　to　Cr　increasing.　FeCrxCoNiB　coatings　gain　a　better　high　temperature　oxidation　resistance　as　x　≥　2　(33.3　at.%).　©　2018