PVC-O pipe, also called biaxial oriented technology PVC pipe, is a new type of pressure pipe made by tensioning of the traditional PVC-U pipe in an axial direction and a hoop direction under high elastic state. It has the advantages that by biaxial tensioning of the material, the molecular chain of the material is changed from a linear structure before tensioning into a net structure after tensioning, so that the PVC-O pipe has a pressure-resistant property about twice as high as that of the PVC-U pipe, and low-temperature impact resistant property and stress cracking resistant property which are five times those of the PVC-U pipe. PVC-O pipe is a new generation of latest pressure water-conveying pipe in our country.