Steel　materials　are　highly　sourced　construction　materials　owing　to　their　robust　mechanical　properties,　and　they　are　widely　used　in　the　construction　industry　for　building　bridges,　tunnels,　skyscrapers,　towers,　ship-metal　parts,　and　other　industrial　metal　applications.　However,　as　steel　has　poor　surface　wear　resistance,　parts　are　susceptible　to　failure　due　to　friction　damage.　To　improve　the　surface　wear　resistance　of　steel　materials,　Ni-based　WC　coating　was　prepared　by　ultra-high-speed　laser　cladding.　Using　low-speed　laser　cladding　as　a　reference,　the　surface　morphology,　microstructure,　and　wear　resistance　of　ultra-high-speed　laser　cladding　of　Ni-based　WC　coatings　were　studied　using　SEM,　EDS,　and　XRD,　respectively.　Experimental　results　revealed　that　the　Ni-based　WC　coating　prepared　by　ultra-high-speed　laser　cladding　exhibited　better　surface　quality　compared　with　that　prepared　by　low-speed　laser　cladding.　Comparatively,　ultra-high-speed　laser　cladding　requires　a　smaller　heat　input　and　a　faster　cooling　rate.　However,　the　dilution　rate　of　the　coating　is　significantly　reduced.　In　addition,　ultra-high-speed　laser　cladding　significantly　reduces　thermal　damage　in　the　WC　coating;　it　inhibits　the　precipitation　of　carbides　and　formation　of　porosities　and　promotes　the　uniform　distribution　of　the　WC　in　the　coating,　thereby　significantly　reducing　stress　localization　in　the　coating　and　also　inhibits　crack　nucleation　in　the　coating.　Because　of　the　reduction　of　porosities,　cracks,　and　other　surface　defects　in　the　coating　and　uniform　distribution　of　WC　particles,　the　Ni-based　WC　coating　prepared　by　ultra-high-speed　laser　cladding　possesses　better　wear　resistance　than　that　prepared　by　low-speed　laser　cladding,　and　the　wear　mechanism　is　abrasion.　©　2020,　Science　Press.　All　right　reserved.