Porous TiO2 have recently attracted a great deal of attentions owing to their high adsorption capacity and catalytic activity, and are widely used in many fields such as dye-sensitized solar cells, environmental remediation, biomedicine engineering and sensor.It is reported that porous TiO2 with large specific surface area can effectively make the photo-generated electrons and holes diffuse to the surface before recombination, thus exhibiting higher quantum yields and photocatalytic activity.Whats more, porous TiO2 can absorb more reactants and increase the contact area, resulting in the increase of photocatalysis reaction rate.TiO2 nanotubes are an ideal photocatalyst.Compared to two-dimensional nano-TiO2 thin film, TiO2 nanotubes have greater surface area and adsorption capacity.The photogenerated electron-hole pairs are more easily reach the surface and enhance photocatalytic activity.Moreover, TiO2 nanotubes are hard to cluster and ease to recycle as compared with nano TiO2 powders, and thus favorable for recycling use.Hence, the study of TiO2 nanotubes has become a hot research field [2].In this paper, TiO2 nanotubes were prepared through hydrothermal method with TiO2 power in high concentration NaOH solution.XRD, SEM, TEM and UV-Vis were adopted to analyze as-prepared TiO2 nanotubes.The influence of the factors, such as NaOH concentration, reaction time and temperature, on the structure and properties of TiO2 nanotubes were investigated.The results show that the uniform TiO2 nanotubes are obtained under optimum preparation conditions: 10mol/L of NaOH, 20h of reaction time and 160 ℃ of reaction temperature.TiO2 nanotubes exhibit higher photocatalytic activity, and the degradation rate of methyl orange (MO) in aqueous solution reached 75.48% after UV irradiation for 30 min.