A　fluorescent　reagent,　2-hydroxy-1-naphthaldehydene-8-aminoquinoline　(HNAAQ)　was　synthesized,　and　an　organically　modified　sol-gel　membrane　for　detection　of　lead　ion　by　using　HNAAQ　as　fluorescence　probe　was　fabricated.　Under　the　optimum　conditions,　by　a　coplanar　effect　and　the　degree　of　molecular　conjugation　due　to　the　complexation　of　Pb2+　with　HNAAQ　the　relative　fluorescence　intensity　I100/I0　of　the　sensing　membrane　is　linearly　increased　over　the　Pb2+　concentration　range　of　1.9　×　10-7　to　1.9　×　10-4　mol/L　with　the　detection　limit　of　8.3　×　10-8　mol/L.　The　preparation　of　this　organically　modified　sol-gel　membrane　and　its　characteristics　were　investigated　in　detail.　©　2007　Elsevier　B.V.　All　rights　reserved.