In　this　paper,　polyvinyl　alcohol　(PVA)　fiber　reinforced　ECC　(Engineered　Cementitious　Composites)　mortar　was　selected　as　the　research　object.　The　effect　of　air　entraining　agent　on　the　tensile　properties　of　PVA-ECC　was　studied　by　uniaxial　tensile　test　with　different　dosages.　The　results　showed　that　the　tensile　strength　reduced　by　adding　air　entraining　agent.　When　the　amount　of　fly　ash　increased　with　adding　a　large　amount　of　air　entraining,　the　tensile　strain　reduced.　In　addition,　the　tensile　strain　of　the　cementitious　material　with　no　fly　ash　increased　when　incorporating　air　entraining　agent.