To　enhance　the　thermal　oxygen　aging　and　ultraviolet　(UV)　aging　resistance　of　asphalt　mixture,　cinnamic　acid-modified　layered　double　hydroxyl　composite　metal　hydroxides　(LDHs)　and　para-aminobenzoic　acid-modified　LDHs　(CA-LDHs　and　PABA-LDHs)　were　prepared　to　improve　the　compatibility　between　LDHs　and　asphalt.　The　road　performance　and　aging　resistance　of　the　modified　asphalt　mixture　were　tested　to　characterize　the　composite　modification　effects　of　the　organic　LDHs　and　antioxidants,　and　the　mechanisms　of　LDHs　and　antioxidants　in　the　asphalt　mixture　were　investigated　using　the　gel　permeation　chromatography　(GPC)　test.　Results　show　that　antioxidants,　LDHs,　CA-LDHs,　and　PABA-LDHs　can　boost　the　aging　resistance　of　base　asphalt　mixture　and　styrene-butadiene-styrene　(SBS)-modified　asphalt　mixture.　CA-LDHs　provide　the　most　significant　improvement,　followed　by　PABA-LDHs,　LDHs,　and　antioxidants　in　descending　order　of　effectiveness.　Additionally,　the　use　of　organic　LDHs　in　combination　with　composite　antioxidants　further　enhanced　the　durability　of　asphalt　mixtures　compared　to　using　a　single　modifier　alone.　Organic　LDHs　and　antioxidants　exhibit　a　synergistic　effect,　improving　the　resistance　of　asphalt　mixture　to　thermal　oxidative　aging　and　UV　aging.　©　2025　American　Society　of　Civil　Engineers.