Ordered　mesoporous　samarium　oxide　(meso-Sm2O3)　and　europium　oxide　(meso-Eu2O3)　have　been　synthesized　using　mesoporous　pure　silica　KIT-6　as　hard　template　under　ultrasonic　irradiation,　and　characterized　by　means　of　X-ray　diffraction　(XRD),　high-resolution　transmission　electron　microscopic　(HRTEM),　selected　area　electron　diffraction　(SAED),　N-2　adsorption-desorption,　and　ultraviolet-visible　diffuse　reflectance　spectroscopy　(UV-vis　DRS).　It　is　found　that　the　fabricated　meso-Sm2O3　and　meso-Eu2O3　materials　possessed　three-dimensionally　(3D)　mesoporous　structures　with　polycrystalline　walls,　a　surface　area　of　134-166　m(2)/g,　and　an　average　pore　diameter　of　8.7-9.4　nm.　The　large　surface　areas　and　unique　optical　properties　suggest　that　these　mesoporous　rare　earth　oxides　have　promising　applications　in　optics　and　catalysis.