The　dissolution　behavior　of　WC　in　three　different　nickel　matrix　systems　is　investigated.　The　results　show　that　the　dissolution　occurs　at　the　rim　of　WC　with　the　precipitation　of　Fe6W6C　in　Ni60A-WC　coatings;　WC　are　loosely-separated,　bridge-bonded　and　reunited　to　coarse　carbide　groups　in　Ni25B-WC　coatings;　in　Ni22AA-WC　coatings　the　WC　are　slightly　dissolved　in　some　locations.　The　larger　concentration　gradient　of　W　and　C　between　WC　particles　and　matrix,　and　higher　Cr　and　Fe　contents　will　accelerate　the　dissolution　of　WC　particles.