Abstract: The effect of reaction heat per unit mass △H⁰ and adiabatic combustion temperature T_ad on the compositions of(TiO₂-Al-C)-(Ti-C-Ni) system is studied.It is found that △H⁰ is a linear function of the fraction of Ti-C-Ni in (TiO₂-Al-C)-(Ti-C-Ni). The slope is controlled by γ, which is the fraction of Ni in Ti-C-Ni, and the cut keeps constant, which is equal to the reaction heat per unit mass of TiO₂-Al-C. When γ=γ₀=45.79%, addition of Ti-C-Ni has no effect on T_ad, when γ<γ₀, T_ad increases. For γ=0.1, T_ad, approximately increases linearly with the increasing addition of Ti-C-Ni, which is verified by experiments.