Isobutyltriethoxysilane　surface　organic　grafted　layered　double　hydroxide　(OLDH)　was　prepared　and　utilized　to　improve　the　ultraviolet　aging　resistance　of　bitumen.　The　results　of　Fourier　transform　infrared　(FTIR)　and　Static　contact　angle　showed　that　isobutyltriethoxysilane　has　been　grafted　on　the　surface　of　LDH　and　the　hydrophilic　property　of　OLDH　was　observably　weakened.　The　storage　stability　test　indicated　that　OLDH　had　better　compatibility　and　stability　in　bitumen　compared　with　LDH,　which　was　due　to　the　decrease　of　hydroxyl　and　the　introduction　of　organic　group　on　the　surface　of　LDH　after　isobutyltriethoxysilane　organic　grafting　modification.　Furthermore,　OLDH　modified　bitumen　showed　more　excellent　high-temperature　behavior　than　that　of　LDH　modified　bitumen.　After　ultraviolet　aging,　the　performance　of　bitumen　seriously　deteriorated　and　the　colloid　stability　notably　decreased.　Comparing　with　LDH,　OLDH　exhibited　better　in　inhibiting　the　performance　deterioration　and　gelefication　of　bitumen　after　ultraviolet　aging,　which　implied　that　isobutyltriethoxysilane　surface　organic　grafting　modification　was　beneficial　to　strengthen　the　improvement　of　LDH　on　the　ultraviolet　aging　resistance　of　bitumen.　©　2020　Elsevier　Ltd