The　effect　of　RE　element　Y　on　the　microstructure　and　properties　of　Ti(C,N)-based　cermet　was　investigated.　Yttrium　can　refine　the　particles　of　carbide　phase　because　it　can　purify　the　interface　between　binder　phase　and　carbide　phase,　and　increase　the　thickness　of　rim　phase　slightly.　The　effect　is　in　the　most　evidence　when　the　mass　fraction　of　Y　is　0.8%　and　when　the　transverse　rupture　strength　and　the　hardness　of　Ti(C,N)-based　cermet　are　maximal.