The preparation of TiC0.7N0.3 powder by SHS in the system of Ti-TiH2-C (N2 atmosphere) was investigated in this study. Inthe preparation of TiC0.7N0.3 powder, the effect of gas pressure, compositions such as Ti, TiH2, C, and additive in mixture onthe reactivity were investigated. At 50 atm of the initial inert gas pressure in reactor, the optimum composition for thepreparation of pure TiC0.7N0.3 was 0.75Ti+0.25TiH2+0.7C+0.5NaCl. The TiC0.7N0.3 powder synthesized in this condition was a single phase with irregular shape.