High surface area anatase (100m²g^-1-1) was modified by addition of La³⁺, Al³⁺,Zr⁴⁺,Ti⁴⁺, Ta⁵⁺ and Nb⁵⁺ ions by impregnation method. Differential thermal analysis exhibits two successive exothermic phenomena attributed to surface area decrease and anatase-rutile transformation. Kinetic measurement of each of them have been performed. The additives slow down these two processes. Lanthane and zirconium are found to be particulary active for surface area stabilization. Low-surface area anatase (11m².g^-1) was prepared and doped according to the same method. Its transformation into rutile is also inhibited but the various influence of the additives were found to be different compared to the high-surface doped anatase.