To　investigate　the　different　effects　of　different　ionic　emulsifiers　on　the　stability　of　emulsified　asphalt，based　on　molecular　dynamics　simulation，　the　double-layer　model　structure　of　＇asphalt-emulsifier-water-emulsifier-asphalt＇was　constructed　by　using　Materials　Studio　software，and　emulsified　asphalt　systems　containing　different　ionic　emulsifier　molecules　were　simulated　to　compare　the　effect　of　anionic　（SDS）/cationic　（CTAC）emulsifiers　on　the　stability　of　emulsified　asphalt.　The　changes　in　the　relative　concentration　distribution，interfacial　film　thickness，interfacial　formation　energy，and　electrostatic　potential　（ESP）　of　the　asphalt　emulsions　were　compared　with　the　addition　of　different　emulsifier　molecules　in　order　to　analyze　the　stability　of　the　emulsified　asphalt.　The　results　show　that　the　SDS　emulsifier　increases　the　thickness　of　the　interfacial　layer　between　asphalt　and　water，reduces　the　interfacial　tension　between　the　two　phases，and　improves　the　stability　of　the　emulsified　asphalt，compared　with　the　CTAC　emulsifier.　From　the　perspective　of　electrostatic　potential　analysis，compared　with　CTAC　emulsifier，SDS　emulsifier　molecule　has　a　larger　maximum　electrostatic　potential　of　the　alkane　chain，and　it　is　more　likely　to　bond　with　atoms　with　negative　electrostatic　potential.　Therefore，the　overall　stability　of　emulsified　asphalt　with　an　SDS　emulsifier　is　better　than　that　of　emulsified　asphalt　with　a　CTAC　emulsifier.　©　2024　Hunan　University.　All　rights　reserved.