A　new　type　of　bimodal-grained　WC-Co　cemented　carbide　coating　was　fabricated,　using　the　raw　materials　consisting　of　the　in　situ　synthesized　nanoscale　WC-Co　composite　powder　as　major　component　and　a　certain　amount　of　ultra-coarse　WC　particles　as　addition.　The　effects　of　coarse　WC　particles　on　the　microstructure,　mechanical　properties　and　wear　behaviour　of　the　coating　were　investigated.　It　was　found　that　with　a　suitable　addition　of　coarse　WC　particles,　the　coating　has　a　decreased　decarburization　and　significantly　increased　wear　resistance,　as　compared　with　the　coating　without　the　addition.　The　coarse　WC　particles　allow　a　certain　degree　of　plastic　deformation　by　dislocation　gliding　so　that　under　wearing　conditions　some　stress　concentration　can　be　released　and　their　fractures　are　inhibited.　A　good　combination　of　coarse　WC　particles　and　WC-Co　nanocomposite　facilitates　high　properties　of　the　coating,　with　the　former　mainly　bearing　the　load　and　resisting　against　penetration　of　the　wear　debris,　and　the　latter　providing　high　hardness　and　also　plastic　accommodation　in　the　wearing　process.　(C)　2016　Elsevier　B.V.　All　rights　reserved.