The　AlxCoCrFeNi(x=1,1.5,x　is　mole　fraction)　high-entropy　alloys　cladding　layers　were　prepared　on　Q235　steel　substrate　by　plasma　cladding.　The　component,　crystal　structure,　microstructure　and　microhardness　of　the　cladding　layers　were　investigated.　The　results　indicated　that　high-entropy　alloys　cladding　layers　had　simple　solid-solution　structure.　The　content　of　aluminum　increased　from　x=1　to　x=1.5,　and　the　phase　composition　transformed　from　the　mixed　FCC+BCC　phase　to　the　single　BCC　phase.　The　microstructure　of　cladding　layers　is　dendrite　structure.　When　x=1.5,　the　nanoparticles　were　deposited　in　the　dendrite.　Al1.5-CoCrFeNi　alloy　had　a　good　metallurgical　combination　with　the　substrate.　A　ferrite　band　with　width　about　80　μm　was　appeared　at　HAZ　near　the　interface　which　was　caused　by　decarburizing　of　pearlite.　With　the　addition　of　aluminum　changed　from　x=1　to　x=1.5,　the　microhardness　of　cladding　layers　increased　from　478HV　to　530HV.　©　2018,　Materials　Review　Magazine.　All　right　reserved.