The　nanostructured　WC-10Co-4Cr　coatings　were　fabricated　by　high　velocity　oxy-fuel　spraying　using　the　in　situ　synthesized　WC-Co　nanocomposite　powder　with　size　of　70-200　nm　and　Cr　addition.　Through　optimization　of　the　processing　conditions,　the　nanostructured　WC-Co-Cr　coating　has　only　a　small　amount　of　decarburized　phase,　a　dense　microstructure　and　an　excellent　combination　of　hardness,　fracture　toughness　and　wear　resistance.　A　series　of　sliding　wear　tests　were　performed　to　investigate　the　wear　behavior　of　the　nanostructured　cermet　coating.　The　evolution　of　the　friction　coefficient,　wear　characteristics　and　their　mechanisms　were　studied　for　the　nanostructured　WC-Co-Cr　coating　with　the　change　of　the　load.　The　present　study　proposes　a　new　understanding　of　the　occurrence　and　the　related　mechanisms　of　the　wear　of　the　cermet　coatings.　(c)　2015　Elsevier　B.V.　All　rights　reserved.