Due　to　the　consideration　of　energy　conservation　and　emission　reduction,　Warm　Mix　Asphalt　(WMA)　is　used　in　construction　and　foamed　asphalt　is　a　common　agent　in　WMA.　The　objective　of　this　paper　is　to　explore　the　foaming　mechanism　and　distribution　law　of　asphalt　and　its　components,　as　well　as　its　basic　properties.　The　expansion　rate　and　half-life　were　used　to　describe　the　foaming　properties　of　the　foamed　asphalt　and　to　determine　the　optimum　water　content.　The　microscopic　images　were　aided　to　study　morphological　changes　in　the　foamed　asphalt.　Moreover,　Molecular　Dynamics　(MD)　simulations　were　widely　used　in　the　study　of　asphalt　materials　such　as　self-healing,　interfacial　behaviors,　and　mechanical　properties.　Based　on　intermolecular　interactions,　energies,　and　trajectories,　the　mechanism　and　performance　of　foamed　asphalt　can　also　be　investigated.　The　molecular　model　of　the　foamed　asphalt　was　established,　and　the　foaming　process　of　the　foamed　asphalt　was　discussed　based　on　the　perspectives　of　the　energy,　density,　and　intermolecular　agglomerations.　The　simulation　results　can　be　a　valuable　reference　for　industry　and　fundamental　research.　©　2022　Elsevier　Ltd