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Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na_2TiO_3, then the resultant Na_2TiO_3 reacts with 3CaO·Al_2O_3·6H_2O resulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO_2·H_2O which eventually converts into CaTiO_3. Higher temperature, concentration of free Na_2O_k (the caustic soda uncombined with aluminate anions in the form of Na_2O) and molar ratio of CaO to TiO_2 are favorable to the conversion of CaO·2TiO_2·H_2O to CaTiO_3. And Al(OH)_4~- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite.