Fe-doped SiO2/TiO2 composite nanoparticles were directly prepared by sol-gel-hydrothermal process, and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), thermal gravimetry (TG), X-Ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectra (DRS). It was found that the Fe3+ was well dispersed in solid solution Of SiO2/TiO2 composite nanoparticles that was about 10 nm with spherical morphology and rich silica layer external surface. It could effectively offer broadband shield for both UVB (290-320 nm) and UVA (320-400 nm). The results of Photodecomposition of methylene blue showed that the photoactivity of Fe-doped SiO2/TiO2 composite was minimized due to the addition of iron ion. (c) 2005 Springer Science + Business Media, Inc.