Carbothermal reduction and nitridation of titanium dioxide was investigated by X-ray diffraction and gas chromatography. The results indicated that anatase was transformed to rutile phase before it reacted to produce TIN. The solid products of the reaction are TiN and TiC. The fraction of TiN in the solid product may he increased by increasing the reaction temperature or decreasing the initial molar ratio of C/TiO2. The gas products of the reaction are mostly CO and trace amount of CO2. The concentration of CO2 in the evolved gas can be decreased by increasing the reaction time or increasing the reaction temperature.