This article prepared a new type PVA fiber with large diameter by plasticizing melt spinning method, which instead of traditional wet-spinning or gel-spinning method.The mechanical properties and microstructure of fiber were characterized by tensile instrument respectively and SEM.Then, the PVA fiber was used in cementitious composites after surface sizing.The test result shown that: the melt-spinning PVA fiber could achieve stress-strain hardening in ECC system, and appeared multi-cracking phenomenon, the flexural deflection and strength is not worse than the Japan Kurary PVA fiber.Finally, the PVA has an advantage in price.