To　improve　the　self-healing　performance　of　micro　cracks　in　cement-based　materials,　higher　fatty　acid　salt　was　used　to　modify　cement　mortar　to　study　the　changes　of　mechanical　properties,　working　properties　and　percolation　properties　of　mortar　under　the　action　of　higher　fatty　acid　salt.　The　effect　of　higher　fatty　acid　salt　on　the　self-healing　performance　of　micro　cracks　in　cement　mortar　was　discussed　combined　with　the　analysis　of　XRD　and　SEM-EDS　of　products　at　the　crack.　Results　show　that　the　addition　of　higher　fatty　acid　salt　can　shorten　the　setting　time　of　mortar　to　a　certain　extent,　However,　has　little　effect　on　the　compressive　flexural　strength　and　fluidity　of　mortar.　An　appropriate　amount　of　higher　fatty　acid　salt　with　solid-liquid　ratio　can　improve　the　compactness　of　cement　mortar,　increase　the　generation　of　calcium　carbonate　at　matrix　cracks,　accelerate　the　self-healing　effect　of　cracks,　and　improve　the　impermeability.　©　2023　Beijing　University　of　Technology.　All　rights　reserved.