A　novel　kind　of　CO2　solid　adsorbents　(xLDH/MA,　x　is　the　loading　of　LDH)　was　prepared　by　loading　of　layered　double　hydroxides　(LDH)　on　the　mesoporous　alumina　(MA)　support.　The　LDHs　in　xLDH/MA　were　evenly　distributed　on　the　surface　of　MA.　xLDH/MA　possessed　a　large　BET　surface　area　(278-378　m(2)/g),　narrow　pore-size　distribution　(4.37-6.23　nm),　and　a　highly　crystalline　framework.　Among　all　of　the　samples,　30LDH/MA　showed　an　excellent　CO2　adsorption　capacity　at　50　degrees　C(1.56　mmol/g),　which　was　1.55　times　larger　than　that　of　unmodified　MA.　Due　to　the　synergistic　effect　between　MA　and　LDH,　30LDH/MA　exhibited　a　higher　surface　area　and　a　more　amount　of　adsorption　sites,　which　were　the　main　factors　improving　its　CO2　adsorption　performance.　The　adsorption　process　of　CO2　on　xLDH/MA　was　dominated　by　the　chemical　adsorption,　and　the　adsorbed　CO2　was　mainly　stored　in　the　form　of　carbonate.　In　addition,　the　30LDH/MA　composite　material　showed　fast　adsorption　kinetics　and　good　regeneration　efficiency.　We　believe　that　such　a　kind　of　porous　alumina-supported　layered　double　hydroxides　would　have　a　great　potential　in　the　applications　for　the　adsorption　of　CO2.