Novel　nanocomposite　materials,　based　on　graphene　(GR)　and　Cd2Sb2O6.8,　were　synthesized　successfully　through　a　facial　one-step　hydrothermal　method　for　the　first　time.　Characterized　by　X-ray　diffraction,　UV-vis　diffuse　reflectance　spectroscopy,　transmission　electron　microscopy,　field　emission　scanning　electron　microscopy　(FESEM),　Fourier-transform　infrared　spectroscopy,　Raman　spectroscopy,　etc.,　it　demonstrated　that　Cd2Sb2O6.8　nanoparticles　were　effectively　anchored　in　GR　sheets.　By　the　degradation　of　rhodamine　B　(RhB)　and　methylene　blue,　such　Cd2Sb2O6.8-GR　nanocomposites　exhibited　a　much　higher　photocatalytic　activity　than　the　pure　Cd2Sb2O6.8.　Especially,　when　the　mass　ratio　of　GR　in　Cd2Sb2O6.8-GR　nanocomposite　was　2%　(labeled　as　Cd2Sb2O6.8-2%GR),　it　possessed　the　optimal　photocatalytic　ability　on　the　degradation　of　RhB　which　was　as　high　as　that　of　commercial　P25.　It　was　proved　that　GR　played　an　important　role　in　the　enhancement　of　photocatalytic　performance　of　composites.　Which　give　a　good　chance　to　make　an　effective　charge　separation　and　generation　of　multifarious　reactive　species,　such　as　(OH)-O-center　dot,　O-center　dot(2)-,　h(+),　e(-).　A　possible　mechanism　of　the　degradation　process　was　carefully　discussed.　This　work　provided　a　new　insight　into　the　photocatalytic　degradation　of　dyes　under　UV　irradiation　and　opens　up　a　new　prospect　to　Cd2Sb2O6.8-GR　photocatalysts.　(C)　2013　Elsevier　B.V.　All　rights　reserved.