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The panicle size of starting materials,the homogeneity of the carbon/oxide mixtures,and the carbon content are important parameters for a rapid reaction.The influences of technological parameters(carbon particle size,oxide particle size,mixing method,carbon content)on the reaction rate of carbothermal reduction and nitridation of titanium dioxide(TiO2)were investigated by a continuous thermo-gravimetric analyzer for large size specimen.The carbon panicle size is the most important parameter for a rapid reaction,but carbon particle may have no influence on the morphology of titanium nitride(TiN)powder.Oxide particles are the precursors of TiN powder,but the TiO2 particles size has very little influence on the reaction rate.The carbon content not only influences the reaction rate to some degree,but also influences the purity of TiN powder.The mixing method of the specimen has very little influence on the reaction rate.These results are suitable for other nitrides and carbides prepared by carbothermal reduction method.