Laser　cladding　Ni-based　WC　composite　coating　was　fabricated　on　the　surface　of　Q235　steel　by　6　kW　fiber　laser.　By　scanning　electron　microscopy　(SEM),　energy　dispersive　spectroscopy　(EDS)　and　micro-hardness　tester,　we　investigated　the　morphology,　composition,　and　micro-hardness　of　the　composite　coating　under　different　laser　power.　The　results　show　that　WC　particles　partially　dissolve　and　react　with　other　elements　to　form　eutectics,　which　exist　in　the　shape　of　block,　strip　and　grain.　The　cladding　height,　penetration　and　dilution　of　laser　cladding　coating　increase　gradually　with　the　increase　of　laser　power.　Moreover,　the　average　hardness　of　the　coating　increases　first　and　then　decreases.　When　the　laser　power　is　2500　W,　cladding　coating　can　get　the　highest　hardness,　which　is　5　times　of　the　matrix　hardness.