Abstract: TiO₂ nanotubes were prepared by hydrothermal synthesis and their photocatalytic properties were investigated in this paper. TiO₂ nano-powder was used as raw material and its pH value was adjusted by NaOH to investigate the effects of reaction temperature, hydrothermal synthesis time on the structure and morphology of the products, and the morphology of the products was characterized by transmission electron microscopy. The results showed that the optimal temperature range was 130～160℃ within the same time 24 h. The visible light catalytic degradation experiments indicated that the titanium dioxide nanotubes exhibited enhanced photocatalytic degradation, and the photo degradation effect was more pronounced at the optimal temperature range was found to be 130℃ to 160℃ over a period of 24 hours. The optimal catalyst input for a 0.5 g/L, 20ml aqueous solution of methyl orange was determined to be 120 mg, with the optimal reaction time being approximately 2 to 3 hours.