Zeolite　NaA　membranes　have　been　widely　used　in　dehydration　of　alcohols　by　pervaporation　because　of　their　excellent　permeability　and　selectivity.　However,　the　zeolite　NaA　membranes　were　criticized　for　the　poor　performance　in　acidic　condition.　Herein,　we　report　a　simple　and　effective　method　to　enhance　acid　stability　of　zeolite　NaA　membranes.　The　key　is　a　positively　charged　polyelectrolyte　complex　(PEC)　was　impregnated　on　the　surface　of　zeolite　NaA　membranes.　The　PEC　was　synthesized　from　chitosan　(CS)　and　sodium　poly　(vinyl　sulfonate)　(PVS).　Fourier　transform　infrared　spectroscopy　(FTIR),　X-ray　diffraction　(XRD)　and　scanning　electron　microscopy　(SEM)　results　indicated　that　the　zeolite　NaA　membranes　suffered　from　severe　damage　in　both　morphology　and　crystal　structure　after　contact　with　acid,　while　the　PEC/NaA　composite　membranes　remained　intact.　Accordingly,　the　PEC/NaA　composite　membranes(1.5　wt%　PEC　in　solution)　exhibited　excellent　water　permeability　and　selectivity　in　acid　solution.　For　acidic　90　wt%　ethanol/water　(pH　=　3)　mixture　separation,　the　permeate　flux　was　875　g/(m(2)　h),　the　water　content　in　permeate　was　as　high　as　99.8　wt%　at　40　degrees　C.　Meanwhile,　the　composite　membranes　showed　a　good　acid　stability　for　more　than　200　h　and　this　was　attributed　to　the　barrier　effect　of　PEC　layer,　as　well　as　the　protonation　ability　of　-NH2　groups　in　PEC.　This　method　is　expected　to　offer　great　opportunities　for　the　dehydration　of　organics　under　acidic　conditions.