High-content　SBS-modified　asphalt　(HCSMA)　was　the　primary　binder　material　used　in　high-quality　pavements.　The　aging　degradation　and　fatigue　damages　of　SBS　cross-linked　networks　were　the　direct　triggers　of　HCSMA　properties　deterioration.　However,　current　main　asphalt　self-repairing　enhancement　technologies　were　unable　to　repair　the　damaged　SBS　structures,　making　it　difficult　to　fully　restore　the　properties　of　HCSMA.　This　study　aimed　to　develop　dual　self-repairing　techniques　for　actively　repairing　the　SBS　damages　in　HCSMA.　To　achieve　this,　the　thermally　initiated　blocked　dynamic　isocyanate　prepolymer　(BDIP)　was　prepared　as　a　modifier　for　HCSMA　by　introducing　blocking　agents　and　dynamic　bonds　into　the　isocyanate　prepolymers.　It　showed　that　BDIP　can　react　with　asphalt　components　containing　polar　functional　groups　to　improve　the　basic　physical　properties　of　HCSMA.　Firstly,　for　the　aging　degradation　of　SBS　networks,　the　isocyanate　groups　released　from　BDIP　through　deblocking　reactions　reacted　with　the　active　end　groups　in　SBS　degradation　products　to　repair　the　aging　degraded　SBS,　thereby　constructing　dynamic　SBS　cross-linked　networks　with　dynamic　covalent　bonds.　Analysis　of　molecular　composition　and　fluorescence　microscopy　observation　showed　that　BDIP　repaired　64　%　of　the　degraded　networks　in　HCSMA　during　mild　aging,　resulting　in　the　SBS　networks　being　nearly　intact.　The　biphasic　reactions　(asphalt　and　SBS　phases)　between　BDIP　and　HCSMA　enabled　HCSMA/BDIP　(HCSMA　modified　with　BDIP)　to　exhibit　excellent　high-temperature　deformation　resistance　both　before　and　after　aging.　Secondly,　for　the　fatigue　damage　of　SBS　networks,　the　reversible　cleavage　exchange　reaction　characteristic　of　dynamic　bonds　was　used　to　repair　the　SBS　fatigue　damages　under　load.　Linear　amplitude　sweep　(LAS)　test　revealed　that　the　reversible　dynamic　disulfide　bonds　in　the　SBS　networks　provided　satisfactory　fatigue　life　and　excellent　fatigue　property　stability　with　aging　for　HCSMA/BDIP.　Additionally,　the　LAS-based　healing　test　confirmed　that　the　dynamic　SBS　cross-linked　networks　improved　the　fatigue　repairing　properties　of　aged　HCSMA/BDIP,　while　maintaining　excellent　fatigue　repairing　property　stability　under　aging　conditions.　Overall,　the　dual　self-repairing　enhancement　mechanisms　of　BDIP　were　confirmed,　HCSMA/BDIP　demonstrated　significant　advantages　over　HCSMA　without　BDIP,　most　notably　exhibiting　at　least　a　50　%　increase　in　shear　viscosity　and　fatigue　life.　©　2025　Elsevier　Ltd