Using　a　high　power　diode　laser　(HPDL)　to　deposit　a　cermet　composite　coating　of　Cu-WC-Ni　on　brass　substrate　in　order　to　increase　surface　abrasion　resistance　whilst　maintaining　good　electrical　conductivity.　The　microstructure　of　the　coating　was　studied　by　using　an　optical　microscope,　a　scanning　electron　microscope　(SEM)　and　X-ray　diffraction　(XRD)　analysis.　The　hardness,　abrasion　resistance　and　conductivity　was　studied　by　using　a　microhardness　tester,　sliding　friction　pin-disk　tester　and　a　resister　tester,　respectively.　It　is　concluded　that　the　phases　of　the　Cu-WC-Ni　composite　coating　constitute　WC　and　W2C　grains;　alpha-Cu,　beta-Cu,　gamma-Cu　dendritic　crystals　and　intermetallic　compounds　of　Cr4Ni15W,　WC　and　W2C　are　evenly　distributed　in　the　coating.　With　the　increase　in　WC　content　the　dendritic　crystal　microstructure　is　refined,　average　hardness　and　abrasion　resistance　increase　accordingly　when　the　mass　fraction　of　WC　reaches　25%,　the　average　hardness　of　the　coating　is　four-times　the　base　metal,　abrasion　loss　is　decreased　to　1/19　that　of　the　base　metal,　and　the　conductivity　is　as　before.