Shape　memory　alloy　(SMA)　fibers　are　used　in　engineered　cementitious　composite　(ECC)　to　achieve　good　selfhealing　properties　in　the　newly　developed　smart　cementitious　material　(SMA-ECC).　This　study　focuses　on　the　effect　of　SMA　fiber　content　and　preloading　level　on　the　self-healing　properties　of　SMA-ECC　through　a　two-stage　four-point　bending　test.　The　self-healing　effect　was　evaluated　in　terms　of　recovery　of　cracks,　mechanical　properties,　and　internal　damage　before　and　after　self-healing.　The　results　showed　that　the　efficiency　of　the　healing　of　cracks　reduced　with　the　increase　in　the　width　of　the　initial　cracks.　Cracks　less　than　50　mu　m　width　can　be　healed　in　SMA-ECC,　while　cracks　larger　than　200　mu　m　width　were　the　upper　limit　for　the　healing.　The　efficiency　of　the　selfhealing　in　terms　of　crack　closure　increased　significantly　with　increasing　SMA　fiber　content　from　0.3%　to　0.7%　but　did　not　change　obviously　when　SMA　fiber　content　increased　from　0.7%　to　1%.　The　recovery　of　flexural　properties　and　damage　decreased　significantly　with　increasing　preloading　level.　A　high　SMA　fiber　content　was　required　for　self-healing　behavior　at　a　high　preloading　level.　At　the　pre-loading　ratio　of　50%　and　70%,　the　recovery　of　flexural　properties　reached　the　maximum　at　the　SMA　fiber　content　of　0.7%.　But　at　the　pre-loading　ratio　of　90%,　the　recovery　of　flexural　properties　increased　with　increasing　fiber　content.