Uniaxial　tensile　test　of　three　ratios　polyvinyl　alcohol　fiber　reinforced　cementitious　composites　(PVA-ECC)　and　the　influence　regularity　on　the　mechanical　properties　of　ECC　under　different　fiber　content　were　studied　in　this　paper.　The　relationship　of　crack　width　and　tensile　stress　was　researched.　Tensile　fracture　energy　and　characteristic　length　were　discussed.　The　result　indicates　that　from　0.308%　to　0.462%　of　PVA　fiber　in　volume,　fracture　energy,　characteristic　length　and　maximum　tensile　strain　for　PVA-ECC　improve　by　128%,　146%　and　128%　respectively.　The　fracture　energy　and　maximum　strain　of　PVA-ECC　increase　by　209%　and　3614%　respectively　comparing　with　that　of　polypropylene　fiber　reinforced　concrete.　PVA　fiber　has　good　resistivity　and　toughening　effect,　and　significantly　improves　the　cracking　resistance　and　deformability　for　ECC.　ECC　shows　strain-hardening　and　multiple　cracking　performances　in　uniaxial　tensile　test.