Phase　pure　anatase　TiO2　nanoparticles　have　been　synthesized　using　a　simple　sol-hydrothermal　method.　The　products　were　characterized　by　X-ray　diffraction,　Raman　spectroscopy,　transmission　electron　microscopy　and　ultraviolet-visible　spectroscopy.　The　results　showed　that　the　TiO2　particles　were　well-dispersed　and　the　average　size　was　limited　in　the　range　of　10　nm.　The　optical　measurement　displayed　the　obvious　quantum-size　effect　of　the　products.