Metal-organic　frameworks　(MOFs)　are　promising　candidates　for　membrane-based　gas　separation　due　to　their　regular　crystalline　lattices　with　relatively　well-defined　pore　structures.　To　date,　the　preparation　of　integrated　MOF　membranes　grown　on　porous　substrates　is　still　a　major　challenge.　Herein,　a　facile　aggregation-based　growth　method　is　developed　to　prepare　a　Co-MOF-74　(referred　to　as　Co-2(dobdc),　H(4)dobdc　=　2,5-dihydroxyterephthalic　acid)　membrane　on　a　nanostructure　array　modified　nickel　(Ni)　foam　substrate.　Ni3S2　nanorod　arrays　directly　grown　from　the　Ni-foam　substrate　can　aggregate　and　effectively　regulate　the　growth　of　Co-MOF-74　crystals　along　a　given　direction.　The　effect　of　reaction　time　on　membrane　growth　is　discussed.　The　resulting　Co-MOF-74　membrane　presents　good　H-2　permeance　and　H-2/CO2　selectivity.