Molybdaenum　trixide　MoO3　was　accessed　to　replace　some　WO3/[WO4]　in　the　NaY(WO4)(2)　crystal.　The　undoped　NaY(W0.8Mo0.2O4)(2)　crystal　was　grown　in　nitrogen　by　using　Czochralski　method.　The　single　crystal　X-ray　diffraction　was　performed,　resulting　in　the　appearance　of　some　different　structure　between　NaY(W(0.8)Wo(0.2)O(4))(2)　and　Nay(WO4)(2)　crystals.　And　spectral　properties　especially　their　Raman　spectra　were　discussed　by　detail.　(c)　2007　Elsevier　B.V.　All　rights　reserved.