The　hybrid　of　carbon　nanotube　(CNT)　and　reduced　graphene　oxide　(RGO)　reinforced　ZK61　composite　was　fabricated　by　a　hot　extrusion　process.　Compared　with　the　raw　ZK61　alloy　and　single-reinforced　composites,　the　hybrid-reinforced　by　RGO　+　CNT　complex　exhibited　significant　enhancements　both　in　mechanical　and　thermal　performance.　By　adjusting　the　proportion　of　RGO　and　CNT　in　ZK61　alloy,　the　obtained　optimum　ZK61/(0.06　wt%　RGO　+　0.54　wt%　CNT)　composite　exhibited　increase　of　25.4%　in　yield　strength,　26.5%　in　ultimate　tensile　strength,　104%　in　failure　strain　and　30.4%　in　thermal　conductivity,　respectively,　in　comparison　with　ZK61　alloy.　The　superior　properties　of　the　nano-hybrid　composite　are　attributed　to　the　synergetic　effects　of　RGO　and　CNT,　leading　to　a　uniform　dispersion　and　integrated　structure　as　well　as　the　enhanced　interfacial　bonding　with　matrix.　The　strengthening　ability　of　RGO　and　CNT　was　calculated　to　quantify　their　individual　contribution　to　the　improvement　in　mechanical　and　thermal　properties　of　the　ZK61　matrix　composite.　The　RGO　+　CNT　hybrids　provide　a　promising　way　to　develop　Mg　matrix　composites　with　impressive　performances.　©　2023,　The　Chinese　Society　for　Metals　(CSM)　and　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.