Films of TiO₂ nanorods prepared under different conditions of hydrothermal synthesis were studied. With an increase in the hydrothermal synthesis temperature at a synthesis time of 24 h, the length of the TiO₂ nanorods formed first increases and then decreases, and the nanorod diameter changes. The TiO₂ film consisting of nanorods 4100 nm long and 100 nm in diameter, prepared at 180°C, exhibits the highest photocatalytic activity. This effect is predominantly associated with high specific surface area of the samples.