In　this　work,　Co(II)-formate　(Co(HCOO)(2))　has　been　demonstrated　feasible　to　be　used　as　stable　aromatic　hydrocarbon　transport　carrier　for　facilitating　aromatic　hydrocarbon　transport　membranes.　Metal-organic　framework　Co(HC00)(2)　materials　with　different　particle　sizes　were　prepared　through　a　solvothermal　synthetic　method,　and　then　were　doped　into　poly(ether-block-amide)　(PEBA).　The　resulting　hybrids　were　finally　deposited　on　the　outer　surface　of　tubular　ceramic　substrate　with　a　dynamic　pressure-driven　assembly　method.　The　morphologies　and　structures　of　the　resulting　Co(HCOO)(2)/PEBA　membranes　were　characterized　by　scanning　electron　microscope　(SEM),　energy　dispersive　X-ray　spectrometer　(EDX),　powder　X-ray　diffraction　(PXRD),　thermogravimetric　analysis　(TGA),　positron　annihilation　lifetime　spectroscopy　(PALS),　and　nanoindentation.　These　membranes　were　then　used　in　separating　aromatic/aliphatic　hydrocarbon　mixtures　through　pervaporation.　When　the　feed　solution　is　10　wt%　toluene/n-heptane　mixtures,　the　permeate　flux　of　the　membrane　is　771　g/(m(2)　h)　with　a　separation　factor　of　5.1.　Meanwhile,　due　to　the　immobilization　effect　of　the　Co(HCOO)(2)　for　Co(II)　ions,　the　Co(HCOO)(2)/PEBA　membrane　showed　stable　separation　performances.　(C)　2016　Elsevier　B.V.　All　rights　reserved.