SBS　modified　bitumen　(SMB)　is　widely　used　for　its　excellent　physical　and　rheological　properties,　but　it　is　susceptible　to　aging　due　to　exposure　to　environmental　factors　such　as　heat,　light,　and　oxygen.　This　aging　process　involves　bitumen　aging　and　SBS　degradation,　which　complicates　the　rejuvenation　of　SMB.　In　order　to　explore　the　rejuvenation　mechanism　of　aged　SMB,　particularly　emphasizing　the　rejuvenation　effects　of　epoxy　compounds　(BUDGE,　TMPGE,　and　RDGE),　a　combination　of　molecular　dynamics　simulation　and　experiments　was　employed.　The　thermodynamic,　chemical,　and　physical　properties　of　rejuvenated　SMB　were　analyzed.　Results　show　that　BUDGE　and　its　repaired　SBS　exhibit　excellent　flexibility　compared　to　TMPGE,　improving　cohesive　energy　density　and　free　volume　of　aged　bitumen,　which　facilitates　recovery　of　ductility　in　aged　SMB.　Conversely,　SBS　repaired　with　RDGE　increases　cohesive　energy　density　of　aged　SMB　while　reducing　free　volume,　which　enhances　stiffness　of　bitumen.　Additionally,　rigid　groups　in　RDGE　inhibit　mobility　of　both　itself　and　the　repaired　SBS,　leading　to　a　reduction　in　the　ductility　of　aged　SMB　to　10.1　cm.　Besides,　SBS　repaired　with　RDGE　shows　strongest　binding　with　resins　and　aromatics,　which　diminishes　lubricating　effect　of　these　components　on　asphaltenes.　This　reduction　in　lubrication　enhances　aggregation　of　asphaltenes,　ultimately　raising　flow　resistance.