To improve the ultra-violet (UV) protection efficacy and maintain the photo-stability of titanium dioxide (TiO₂) nanoparticles, which are used as a raw material for sunscreen cosmetics, the surface of titanium dioxide nanoparticles was modified in turn with SiO₂ and FeOOH using the liquid-phase deposition (LPD) technique. Calcination induced crystalline phase transition of Ti0₂ nanoparticles and a covalent bonding between the core and coating material, which were investigated by Fourier-transform infrared spectroscopy (FT-IR) and the x-ray diffraction (XRD) method, respectively. The modified Ti02 particles showed a 17% enhanced UVA protection factor. The color of the modified particles was also similar to that of skin, which implicates the increased possibility of the commercialization for sunscreen cosmetics.