Dehydrogenation　coupling　of　methane　(DCM),　which　can　be　effectively　used　to　produce　low　carbon　alkenes,　has　the　advantages　of　rich　raw　materials,　simple　reaction　device,　low　energy　consumption,　etc.　Herein,　we　report　a　series　of　Co　doped　perovskite　porous-dense　BaCe0.9Y0.1CoxO3-delta(BCYCx)　membrane　for　DCM.　After　treatment　in　a　reduced　atmosphere,　a　large　number　of　Co　nanoparticles　will　exsolute　on　the　surface　of　BCY.　The　metal-oxide　interface　is　helpful　to　activate　the　C-H　bonds,　inhibit　the　carbon　deposition,　and　so　on.　The　XRD,　SEM　and　XPS　prove　that　Co　nanoparticles　homogeneously　distributed　on　the　BCYCx　porous　layers,　which　will　create　a　large　quantity　of　catalytic　active　sites.　At　1100　C,　the　highest　concentration　of　C-2　product　was　5.66%　(5.25%　ethane　+　0.41%　ethylene)　in　output　gas　when　methane　conversion　reaches　a　maximum　value　of　24.8%,　and　the　C-2　selectivity　gets　to　45.6%.　We　further　demonstrate　the　catalytic　performance　of　high-temperature　DCM　without　obvious　decrease　after　running　for　30　hours.