Abstract: Based on thermodynamic analysis, titanium carbonitride were prepared by carbothermal reduction from high titanium slag which were compounded by TiO₂-CaO-SiO₂-Al₂O₃-MgO based on the titanium-bearing blast furnace slag of PZH Steel. The products of carbonthermal reduction process in different of atmosphere （argon, nitrogen） were confirmed. The phase composition and microstructure of sintered materials were investigated by X-ray diffraction and scanning electron microscope. The results confirm that the final products consist mainly of TiC in argon atmosphere and TiC_0.3N_0.7 in nitrogen atmosphere. The grain size of TiC in argon atmosphere is smaller about 2-4μm than Ti（C,N） in nitrogen atmosphere in the same of experiment condition.