Laser　clad　Ni-based　WC　composite　coating　was　fabricated　on　Q235　steel　surface　by　using　a　6　kW　fiber　laser.　The　morphology,　composition,　microhardness　and　wear　resistance　of　the　composite　coating　with　different　content　of　WC　particles　were　studied　by　means　of　scanning　electron　microscopy　(SEM),　energy　dispersive　spectroscopy　(EDS),　X-ray　diffraction　(XRD),　microhardness　and　wear　tests.　The　results　show　that　with　the　increasing　of　content　of　WC　particles,　the　dilution　rate　of　the　cladding　layer　decreases　firat　and　then　increases,　when　the　WC　content　is　20%,　the　dilution　rate　is　minimum.　In　the　process　of　fiber　laser　cladding　the　mixture　of　WC　particles　and　Ni-based　alloy　powder,　residual　WC　particles　partially　dissolve　and　react　with　other　elements　to　form　eutectics,　which　exist　with　the　shape　of　lumpy,　strip　and　spherical.　With　the　increasing　of　WC　content,　the　structure　of　the　cladding　layer　is　refined.　The　main　phases　of　the　laser　cladding　layer　are　γ-Ni,　M7C3,　M23C6,　CrB,　WC　and　W2C.　With　the　increasing　of　WC　content,　the　average　hardness　of　the　cladding　layers　increases;　when　the　mass　percent　of　WC　particles　is　40%,　the　average　hardness　of　the　composite　coating　can　reach　more　than　five　times　of　the　matrix.　When　the　mass　percent　of　WC　particles　is　20%,　wear　resistance　of　the　cladding　layer　is　the　best,　the　wear　resistance　of　the　coating　can　reach　more　than　three　times　of　the　Ni60A　coating.　©　2016,　Editorial　Office　of　Transactions　of　Materials　and　Heat　Treatment.　All　right　reserved.