Nanoscale　WC-η　composite　powder　was　synthesized　by　in　situ　reaction　of　tungsten　oxide,　cobalt　oxide　and　carbon　black　mixtures　for　fabricating　the　nanostructured　WC-based　coating　in　which　the　conventional　Co　matrix　was　substituted　for　η　phases　(i.e.　Co6W6C,　Co3W3C,　Co2W4C,　etc)　due　to　their　excellent　corrosion　resistance　to　molten　zinc.　The　effects　of　the　carbon　addition　of　the　raw　powders　and　the　temperature　on　the　phase　constitutions　of　the　as-synthesized　composite　powders　have　been　investigated.　Subsequently,　the　powder　was　agglomerated　and　heat-treated　to　prepare　the　feedstock　for　high　velocity　oxy-fuel　(HVOF)　thermal　spraying.　By　optimizing　the　preparation　processes,　a　nanostructured　WC-based　coating　with　significantly　improved　mechanical　properties　and　corrosion　resistance　to　molten　zinc　has　been　obtained　as　compared　to　conventional　coatings.