Anatase-type TiO2 fine powders were synthesized under hydrothermalcondition. The precursor was obtained via precipitation route using Ti(SO4)2. Thecharacterization of the as-prepared sample was confirmed by TEM, XRD, UV-Vis andlow temperature N2 adsorption measurements(BET). The photocatalytic activity wasalso investigated by the degradation of methyl orange solutions. The particles ofthe as-synthesized sample with narrow size distribution had an average diameterof about 24 nm. The specific BET surface area of the as-synthesized sample wasabout 56 m2?g-1,which is similar to the commercial TiO2(P25). The preparedmaterials showed the similar photocatalytic activity when compared with theperformance of commercial TiO2(P25).(20060001032), 国防科工委军工遗留专项基金(科工计［2007］840)项目和国家大学生创新训练计划项目资助