A　two-stage　compressive　test　was　adopted　to　study　the　self-healing　performance　of　a　smart　cementitious　composite　SMA-ECC　under　compression.　The　ultrasonic　pulse　and　sorptivity　tests　were　used　to　track　self-healing　ability　and　resistance　to　internal　damage,　respectively.　A　total　of　32　groups　of　specimens,　including　28　groups　of　SMA-ECC　specimens　and　4　groups　of　ordinary　ECC　specimens,　were　tested　with　various　fiber　contents　and　preloading　levels.　The　strength　recovery　rate,　relative　dynamic　elastic　modulus　recovery　rate　before　and　after　self-healing,　and　cumulative　water　absorption　were　measured　during　the　tests.　It　was　found　that　the　strength　recovery　rate　of　the　SMA-ECC　increased　by　29.2%　to　37.2%　compared　to　the　ordinary　ECC.　The　elastic　modulus　recovery　rate　after　self-healing　of　the　SMA-ECC　is　approximately　3　to　10　times　that　of　the　ordinary　ECC,　and　SMA-ECC　with　a　0.9%　fiber　content　exhibits　the　best　healing　effect,　with　a　remarkable　194%　increase　in　elastic　modulus　recovery　rate　compared　to　ECC.　As　for　internal　damage,　an　increase　in　fiber　content　corresponds　to　a　decrease　in　relative　sorptivity　coefficient　(η)　in　most　cases.　Notably,　for　SMA-ECC　specimens　featuring　a　0.9%　fiber　content,　η　reaches　its　nadir,　hovering　around　0.7.　The　situation　takes　an　unexpected　turn　when　fiber　content　hits　1%,　as　the　relative　sorptivity　coefficient　experiences　a　14.9%　increment　compared　to　the　SMA-ECC　with　0.9%　fiber　content.　Based　on　the　test　results,　it　is　concluded　that　the　SMA-ECC　has　excellent　compressive　recovery　performance　and　the　ability　to　resist　internal　damage.　The　optimal　SMA　fiber　content　for　the　self-healing　performance　of　the　SMA-ECC　is　determined　to　be　0.7%　to　0.9%.　©　2023