To　achieve　the　separation　and　purification　of　hydrogen,　the　porous　carrier-supported　Pd　membrane　was　studied　in　this　paper.　Porous　carrier-supported　Pd　membrane　has　attracted　much　attention　because　it　can　effectively　save　cost　and　improve　hydrogen　permeability.　Porous　ceramic　is　an　ideal　negative　carrier　for　Pd　membrane　because　of　its　high　porosity　and　pore　size　distribution　in　nanometer　scale,　however,　porous　ceramic　is　prone　to　local　defects,　which　reduces　the　hydrogen　and　nitrogen　selectivity　of　Pd　membrane.　To　solve　the　above　problems,　the　porous　alumina　(traditional)　matrix　was　modified　by　slurry　impregnation-drawing-sintering　method　to　overcome　the　matrix　defects　and　improve　the　hydrogen　and　nitrogen　selectivity　of　Pd　membrane.　Results　show　that　the　hydrogen　and　nitrogen　selectivity　of　traditional　substrate　modified　and　then　plated　with　Pd　film　is　significantly　improved.　At　773　K　and　0.　1　MPa,　the　hydrogen　and　nitrogen　separation　coefficient　of　Pd　membrane　is　as　high　as　14　000,　which　is　much　better　than　that　of　Pd　membrane　before　matrix　modification　(hydrogen　and　nitrogen　separation　coefficient　1　000).　©　2025　Beijing　University　of　Technology.　All　rights　reserved.