Supported　Cu-based　catalysts　are　promising　catalysts　for　RWGS　reactions.　Herein,　CuMgAl-LDHs　(LDHs:　Layered　double　hydroxides)　were　used　as　the　precursors　to　obtain　supported　Cu　with　good　dispersion　and　high　stability.　The　reduction　of　CuMgAl-LDH　at　400　degrees　C　led　to　the　formation　of　0.3CuMgAl-LDH-400,　with　Cu　nanoparticles　well　dispersed　on　MgO/Al2O3,　which　exhibited　superior　activity　and　high　stability　for　RWGS.　33.5　%　of　CO2　was　converted,　with　selectivity　of　almost　100　%　to　CO　at　350　degrees　C　under　a　high　space　velocity,　among　the　highest　for　RWGS　ever　reported　for　Cu-based　catalysts,　especially　at　a　low　reaction　temperature.　In-situ　DRIFTS　and　CO2-TPD　revealed　that　its　superior　performance　is　attributed　to　high　Cu　dispersion　which　is　beneficial　for　the　dissociation　of　H-2,　as　well　as　the　presence　of　variety　of　basic　sites　for　adsorption　towards　CO2　to　facilitate　the　formation　of　formates.　This　study　demonstrates　the　great　opportunity　of　LDHs　in　the　preparations　of　supported　metal-based　catalysts.