Two　new　lead(II)　borate-sulfate　mixed-anion　compounds,　namely,　Pb-4(BO3)(2)(SO4)　and　Pb-2[(BO2)(OH)](SO4),　have　been　prepared　by　using　high-temperature　melt　method　or　hydrothermal　reaction.　These　compounds　exhibit　two　different　types　of　3D　structures　composed　of　the　same　anionic　units　of　BO3　triangles　and　SO4　tetrahedra　which　are　interconnected　by　lead(II)　cations.　In　Pb-4(BO3)(2)(SO4),　the　lead(II)　ions　are　bridged　by　borate　anions　into　3D　[Pb-4(BO3)(2)](2+)　architectures　with　1D　tunnels　of　8-member　rings　along　the　a-axis,　which　are　filled　by　the　sulfate　anions.　In　Pb-4(BO3)(2)(SO4),　the　lead(II)　ions　are　interconnected　by　borate　and　sulfate　anions　into　2D　Pb-B-O　and　Pb-S-O　layers　parallel　to　the　ab　plane,　respectively,　and　these　layers　are　further　condensed　into　the　3D　lead(II)　borate-sulfate　framework.　TGA　and　DSC　studies　indicate　that　Pb-4(BO3)(2)(SO4)　is　congruently　melting　with　a　melting　point　of　689　degrees　C　whereas　Pb-4(BO3)(2)(SO4)　decomposes　at　approximately　335　degrees　C.　UV/Vis/NIR　optical　diffuse　reflectance　spectrum　measurements　reveal　the　optical　band　gaps　of　4.03　and　4.08　eV　for　Pb-4(BO3)(2)(SO4)　and　Pb-2[(BO2)(OH)](SO4),　respectively.　Furthermore,　the　electronic　structures　of　Pb-4(BO3)(2)(SO4)　have　also　been　calculated.