Using the atomic layer deposition technology, the fabrication of TiO2 thin protecting film on silver ornaments with a thickness uniformity less than 3.5% is realized. The X-ray diffraction test results show that the structure of TiO2 thin film is amorphous structure at the deposition temperature of 100 ℃, while the thin film presents anatase phase at the deposition temperature of 250 ℃. The corrosion experiment results show that the TiO2 thin films with the thickness of 30 nm and 45 nm both have the anti-tarnishing ability, while the ability of the latter is better. The spectrum test results show that, under the condition that the appearance of silver ornaments is not affected, the single layer of TiO2 as protecting film is insufficient to achieve the best anti-tarnishing effect.