A　new　sodium　strontium　aluminoborate,　NaSr7AlB18O36,　has　been　synthesized　by　high-temperature　solution　reaction　at　860　degrees　C.　Its　crystal　structure　was　established　by　single-crystal　X-ray　diffraction　technique:　the　space　group　R　(3)　over　barc　(No.　167),　cell　parameters　a　=　11.356(2)　angstrom,　c　=　36.655(7)　angstrom,　V　=　4093.7(12)　angstrom(3),　and　Z　=　6.　It　is　isostructural　with　Sr8MgB18O36　and　the　crystal　structure　consists　of　the　cyclic　B18O3618-　building　unit　of　corner-sharing　twelve　BO3　triangles　and　six　BO4　tetrahedra.　Each　B18O3618-　group　is　bonded　to　six　octahedrally　coordinated　Al3+　centers　via　Al-O　bonds　to　generate　a　3D　(3)(infinity)[Al(B18O36)](15-)　framework　that　has　intersecting　open　channels　occupied　by　Sr2+/Na+　cations.　The　IR　spectrum　has　further　confirmed　that　the　compound　contains　low　symmetric　BO3　and　BO4　groups;　UV-Vis　diffuse　reflectance　spectrum　revealed　an　optical　band　gap　of　about　3.65　eV;　while　solid-state　fluorescence　spectrum　exhibited　a　broad　emission　band　with　the　emitted　main　peak　localized　at　about　533.3　nm　and　shoulder　at　420　nm　upon　excitation　by　laser　of　325　nm.