To　improve　the　aging　resistance　of　bitumen　for　the　construction　of　durable　flexible　pavement,　the　composite　of　antioxidants　and　cinnamic　acid　intercalated　layered　double　hydroxides　(CA-LDHs)　were　applied　to　modify-four　styrene–butadienestyrene　(SBS)　modified　bitumens　(SMBs)　aiming　at　revealing　the　anti-aging　mechanism　of　different　modifiers　according　to　the　aging　behaviors　of　SMBs　which　were　evaluated　by　the　physical　and　rheological　properties,　characteristic　functional　groups　and　chemical　compositions　of　SMBs　before　and　after　thermal-oxidative　and　ultraviolet　(UV)　aging.　The　results　show　that　antioxidants/CA-LDHs　can　simultaneously　improve　the　thermal-oxidative　and　UV　aging　resistance　of　four　kinds　of　SMBs.　Compared　with　the　composite　of　pentaerythritol　tetrakis　(3-(3,5-di-tert-butyl-4-hydroxyphenyl)　propionate)　(1010),　tris　(2,4-di-tert-butylphenyl)　phosphite　(1　6　8)　and　CA-LDHs,　the　composite　of　octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate　(1076),　tris　(2,4-di-tert-butylphenyl)　phosphite　(1　6　8)　and　CA-LDHs　shows　a　better　improvement　effect　on　the　anti-aging　performance　of　SMB.　LDHs　can　shield　UV　light　and　prevent　oxygen　from　penetrating　into　SMB,　and　antioxidants　can　capture　and　decompose　intermediate　products　generated　during　aging,　these　effects　would　restrain　the　oxidative　aging.　It　is　concluded　that　there　is　a　synergistic　effect　between　antioxidants　and　LDHs　in　improving　the　thermal-oxidative　and　UV　aging　resistance　of　SMBs.　©　2022　Elsevier　Ltd