Seal　materials　often　lose　their　effectiveness　due　to　the　wear　of　surface　under　the　combined　effect　of　environment　and　load.　In　this　research,　a　metallurgical　bonding　composite　coating　reinforced　with　nickel-coated　tungsten　carbide　(Ni-WC)　particles　was　produced　on　40Cr　carbon　steel　substrate　by　plasma　sprayed.　The　bond　strength　of　the　coating/substrate　interface　and　the　tensile　strength　of　the　coating　itself　reached　260-330　and　100-132MPa,　respectively.　Effects　of　Ni　and　WC　contents　on　the　wear　behavior　of　the　coating　have　been　systematically　investigated　at　two　different　wear　conditions,　namely　the　high　stress　pin-on-disk　abrasion　and　three-body　abrasive　wear.　The　results　show　that　the　higher　the　Ni　content　in　the　coating,　the　lower　the　hardness　and　wear　resistance.　In　stress　pin-on-disk　abrasive　wear,　the　mass　percent　of　Ni　in　the　coating　having　the　lowest　wear　amount　was　40%,　and　which　was　60%　in　three-body　abrasion.　In　view　of　the　above,　the　WC　reinforcement　of　the　composite　coating　plays　an　important　role　in　protecting　the　matrix　from　being　worn-out,　whereas　in　the　abrasive　wear,　the　wear　mechanism　is　mainly　controlled　by　the　scratching　and　micro-cutting　of　the　matrix　followed　by　the　pull　out　of　WC　particles　due　to　the　scratching　action　of　abrasives.　The　wear　resistance　of　the　40Cr　carbon　steel　composite　coating　(Ni　-WC)　is　better　than　that　of　the　flame　overlaid　coating.