In　situ　NbC　reinforced　CoCrCuFeNiMn(NbC)(x)　(x=0,　0.05,　0.1,　0.2,　0.3,　0.4)　high　entropy　alloys　were　prepared　by　plasma　cladding　on　the　Q235　steel.　The　phase　constitution,　microstructure　and　microhardness　of　the　cladding　layer　were　investigated.　The　results　show　that　C　and　Nb　addition　doesn＇t　cause　complex　phase　and　the　diffraction　peaks　are　composed　of　feel,　fcc2　and　NbC　phase.　Most　of　the　NbC　is　deposited　in　the　interdendrite　and　a　few　of　them　is　dendrite.　The　shape　of　NbC　is　related　to　its　content.　When　x　is　small,　NbC　is　granular.　When　x　is　large,　NbC　is　granular,　strip　and　cross　dendritic.　Compared　with　that　of　the　matrix,　the　hardness　of　in　situ　high　entropy　alloy　matrix　composite　is　significantly　improved.　The　hardness　of　the　cladding　layer　is　increased　with　more　NbC　in　a　certain　range　(x=0　similar　to　0.4).