Carbothermal reuction of titaniferrous magmetite with carbon was experimentally investigated in order to get fundamental data for the production of rutile substitute from domestic titaniferrous magnatite ore. The proper condition for the reduction of titaniferrous magnetite was as follows : reaction temperature was 1150℃, equivalent ratio of carbon to titaniferrous magnetite was 9.0 and reaction time was 60min. Activated carbon, pitch and charcoal acted as good reducing agent in this reduction. The addition of ferric chloride to titaniferrous magnetite and carbon increased the rate of reduction of titaniferrous magnetite significantly. Reduction rate data under isothermal condition from 1100℃ to 1150℃ were fitted to different rate equations and have been found to be well represented by the equation 1-2x/3-(1-x)^2/3=kt, which is developed assuming diffusion of reactants through the product layer is the controlling step. Under above mentioned conditions, all Fe-oxide in the titaniferrous magnetite was reduced to metal Fe. Rutile substitute was prepared from this reduced titaniferrous magnetite by magnetiic separation.