The purpose of this research is to investigate the effects of Co, Co-Ti addition on the sintering characteristic of (Ti_(1-x)Alx)N material synthesized by the direct nitriding method for a application as a cermet material. The observed shrinkage rates of (Ti_(1-x)Alx)N pellets increase with the additive (Co, Co-Ti) content, temperature and time, and also the pellets with the same additive content exhibit the shrinkage behavior that depends on the Ti/Al ratio. However, although the shrinkage rates in this study is the mast higher (36%), the density of the sintered (Ti_(1-x)Alx)N pellet is below 80% density in theory because of the partial segregation and the dense band defect of AlCo compound. Consequentely, it is considered that Co was not effective as a binder material because the wettability of liquid Co metal on (Ti_(1-x)Alx)N materials is poor, In (Ti_(1-x)Alx)N with Ti-Co additive, the stoichiometric TiN is transformed by the under-stoichiometric TiNx(x<1.0) during sintering, leading to the good properties such as hardnees and hot oxidation.