The　stability　of　membrane　is　a　key　issue　for　pervaporation　separation　of　aromatic/aliphatic　hydrocarbon　mixtures.　In　this　study,　in　order　to　enhance　the　stability,　composite　membrane　with　＂pore-filling＂　structure　was　formed　on　porous　ceramic　tubular　substrate.　A　simple　self-crosslinking　strategy　based　on　the　unique　hyperbranched　macromolecule,　Bottom　W3000,　was　utilized　in　the　preparation　procedure.　The　hydroxyl　and　carboxyl　groups　On　Bottom　W3000　molecules　reacted　at　intramolecular　and　intermolecular　during　thermal　cross-linking　process,　and　then　hyperbranched　polymers　were　assembled　onto　the　top　layer　and　sublayer　of　the　ceramic　substrate.　The　morphologies　and　structures　of　＂pore-filling＂　composite　membrane　were　characterized　by　FTIR,　SEM,　and　Nano　Indenter.　Moreover,　＂non-pore-filling＂　membrane　was　also　prepared　by　the　same　method　with　an　additional　＂plugging-holes＂　step.　Both　of　these　two　composite　membranes　were　used　for　separating　toluene/n-heptane　mixtures.　The　results　indicated　that　the　＂pore-filling＂　membrane　showed　more　stable　separation　performance,　clue　to　its　excellent　anti-swelling　properties.　This　work　thus　not　only　illustrated　a　new　approach　for　the　preparation　of　＂pore-filling＂　membrane,　but　also　produced　a　potentially　useful　organic/inorganic　composite　membrane　for　aromatic/aliphatic　hydrocarbon　mixtures　separation.　(C)　2014　Elsevier　B.V.　All　rights　reserved,