N-doped TiO 2 thin films were prepared on 316L stainless steel orthodontic brackets using the RF magnetron sputtering method .The microstructure and composition of specimens were analyzed by field emission scanning electron microscope (FESEM) equipped with energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The corrosion resistance of the as-prepared samples was evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and a static immersion test in simulated oral solutions . Results showed that N-doped TiO 2 thin film was nano-sized anatase structure, with uniform and compact surface. In artificial saliva and 1.23% APF solutions, the as-prepared thin films lower the corrosion current density and increase the polarization resistance, indicating improved corrosion resistance. Ni or Cr out-diffusion level is far lower than the recommended daily doses, indicating the N-doped TiO 2 thin films may be safe for clinical use.