Based　on　molecular　dynamics，the　models　of　emulsified　asphalt　system　without　salt　and　with　salt　were　established，and　the　effect　of　metal　cations　on　the　stability　of　sodium　dodecyl　sulfate(SDS)anionic　emulsified　asphalt　was　studied.　The　effect　of　Ca2+/Mg2+　on　the　stability　of　emulsified　asphalt　systems　was　analyzed　by　the　relative　concentration　distribution，the　molecular　inclination　of　the　emulsifier　and　the　interaction　energy　between　the　facets　of　the　emulsions.　The　results　show　that　compared　with　the　system　without　salt，the　addition　of　Ca2+/Mg2+in　the　salt-containing　system　would　reduce　the　adsorption　capacity　of　the　interfacial　film，and　the　binding　energy　between　the　asphalt　phase　and　the　aqueous　phase，lead　to　the　instability　of　the　emulsified　asphalt　system.　The　calculated　results　of　molecular　simulation　are　consistent　with　the　experimental　conclusions，verifying　the　correctness　of　the　model.　©　2023　Tongji　University.　All　rights　reserved.