TiCN substrate cermets cutting tool has very good application. Compared with tungsten carbide cutting tool, cermets cutting tool has advantages of lower density, harder, much lower friction for machining steel, better thermal stability when machining, close toughness, lower causticity and heat conduction, better wear-resistance. Working in the same condition, TiCN based cermets cutting tool has longer using life and can be used under faster cutting speed. We can get more finish work-piece with smoother surface using cermets cutting tool. From above, we have used TiCN based cermets cutting tool to replace WC based carbide cutting tool in some fields successfully. It fills up the gap between WC based carbide and ceramic. It is suitable for semi-finishing and finishing machining of steel and wear part specially.