This　paper　studied　covalent　crosslinked　assembly　of　multilayer　organic-inorganic　composite　membranes　for　pervaporation　performance.　First,　tubular　ceramic　substrates　were　pre-treated　using　dynasylan　ameo　silane　coupling　agents.　Then,　poly　acrylic　acid　(PAA)/poly　vinyl　alcohol　(PVA)/glutaraldehyde　(GA)　was　dynamically　assembled　on　to　the　inner　surfaces　of　tubular　ceramic　substrates　by　LbL　technique.　Subsequently,　the　composite　membranes　were　thermally　cross-linked　to　form　covalent　bonds.　The　covalently　crosslinked　multilayers　were　stable,　which　could　be　used　for　pervaporation　fields.　The　effects　of　layer　numbers,　filtration　time,　molecular　weight　of　PVA　and　crosslinking　temperature　were　investigated.　Results　show　that　the　organic-inorganic　tubular　composite　membrane　shows　excellent　pervaporation　performance　for　the　separation　of　ethanol/water,　and　the　membrane　obtained　with　five　trilayers　has　a　permeate　flux　of　102　g/(m2·h)　while　the　mass　fraction　of　water　in　the　permeate　is　99.5%.