In　order　to　enhance　the　water-solubility　and　biological　utilization　rate　of　chrysin,　sodium　5,7-dihydroxylflavone-8-sulfonate　(1,　[Na(H2O)　1/2]X,　X　=　C15H9O4SO3,　5,7-dihydroxylfla-　vone-8-sulfonate)　was　synthesized　and　its　structure　was　identified　on　the　basis　of　NMR,　FT-IR　and　elemental　analysis.　The　assembly　of　5,7-dihydroxylflavone-8-sulfonate　with　diethylamide　cation　afforded　diethylamide　5,7-dihydroxylflavone-8-sulfonate　(2,　NH2(CH2CH　3)2X)　which　was　characterized　by　FT-IR　and　elemental　analysis.　The　crystal　structures　of　1　and　2　were　determined　by　X-ray　single-crystal　diffraction　analysis.　The　crystal　of　1　is　of　triclinic　system,　space　group　P1̄,　with　a　=　8.5628(13),　b　=　12.8916(19),　c　=　13.562(2)　Å,　a　=　82.494(1),　β　=　78.601(2),　γ　=　84.033(2)°,　C　30H20Na2OI5S2,　Z=　2,　Mr　=　730.59,　V=　1450.3(4)　Å3,　Dc　=　1.673　g/cm3,　F(000)　=　748,μ　=　0.295　mm-1,　the　final　R　=　0.0641　and　wR　=　0.1458.　The　crystal　of　2　crystallizes　in　the　triclinic　system,　space　group　P1̄,　with　a　=　7.689(2),　b　=　11.184(3),　c　=　11.734(3)　Å,　α　=　74.268(3),　β　=　81.751(4),　γ　=　87.991(3)°,　C19H21NO7S,　2　=　2,　M　r=　407.43,　V=　961.2(4)　Å3,　Dc　=　1.408　g/cm3,　P(000)　=　428,　μ　=　0.210　mm-1,　the　final　R　=　0.0484　and　wR　=　0.1195.　In　1,　the　three-dimensional　structure　is　organized　into　organic　and　inorganic　regions;　the　flavone　skeletons　are　stacked　into　organic　regions　by　π　π　stacking　interactions;　inorganic　regions　are　generated　by　Na-O　coordination　bonds　among　sulfonate　groups,　coordinated　water　molecules　and　Na1.　The　sulfonate　groups　play　an　important　role　as　a　bridge　of　inorganic　and　organic　regions.　One-dimensional　chain　structure　of　2　is　extended　by　N-H　O　hydrogen　bonds　and　π　π　stacking　interactions.　Furthermore,　the　antioxidant　activity　of　1　was　evaluated.　The　scavenging　activity　of　1　to　DPPH　free　radical　is　better　than　that　of　the　parent　compound　chrysin.