Active　flexible　rejuvenators　achieved　high-quality　regeneration　of　aged　SBS　modified　bitumen　(SMB)　by　reconstructing　the　aged　SBS　cross-linked　structure　while　also　an　incorporating　bitumen　component　reducing　agent　(aromatic　oil,　AO).　However,　the　impact　of　active　flexible　rejuvenators　with　different　molecular　structures　on　the　ultraviolet　(UV)　radiation　durability　of　regenerated　SBS-modified　bitumen　remains　unclear,　making　it　impossible　to　evaluate　the　long-term　effectiveness　of　these　rejuvenators.　In　this　study,　aged　SMB　was　subjected　to　composite　regeneration　using　active　flexible　rejuvenators　with　different　molecular　structures　and　AO.　Subsequently,　the　regenerated　SMB　was　subjected　to　UV　aging.　By　comparing　it　with　SMB　regenerated　with　only　AO,　the　influence　of　active　flexible　rejuvenators　with　different　molecular　structures　on　the　UV　aging　properties　of　the　regenerated　SMB　was　investigated.　FTIR　results　revealed　that　the　SBS　cross-linked　structure,　which　had　been　reconstructed　by　the　active　flexible　rejuvenators,　underwent　continued　degradation　and　breakage　during　UV　aging.　This　process　consumed　UV　radiation　energy　and　oxygen,　thereby　partly　inhibiting　the　oxidative　condensation　of　the　regenerated　bitumen.　The　SARA　fractions　analysis　indicated　that　active　flexible　rejuvenators　could　slow　down　the　volatilization　of　light　components　and　their　rate　of　oxidative　condensation　during　UV　aging　by　reconstructing　the　aged　SBS　cross-linked　structure.　The　incorporation　of　active　flexible　rejuvenators　mitigated　the　deterioration　of　the　physical　and　rheological　properties　of　the　regenerated　SMB　subjected　to　UV　radiation.　When　utilized　in　comparison　to　solely　employing　bitumen　component　reducing　agents,　active　flexible　rejuvenators　were　capable　of　bolstering　the　aging　resistance　of　SMB　that　had　underwent　regeneration　by　reconstructing　the　cross-linked　structures　of　aged　SBS.　The　effectiveness　of　active　flexible　rejuvenators　in　enhancing　the　aging　resistance　of　SMB　during　regeneration　varies,　owing　to　their　differing　sensitivities　to　ultraviolet　radiation　based　on　their　molecular　structures.　This　study　offered　data　support　for　optimizing　the　molecular　structure　of　active　flexible　rejuvenators.　©　2025　Elsevier　Ltd