The raw matorial of the plastic corrugation pipe is HDPE, resisting corrosive, acid and alkali, preventing the prestressing muscle from boing eroded. Many prestressing structure suffor severe influence from environment, such as deice salt or brine. Metal pipe have not permanent anticorrosive capability, cannot rosist water lcakage, while plastic corrugation is capable to provide a barrier protection for prestressing muscle, prevent the injurant pollution from penetrating the pipe, therefore, good pordurable performance of prestressing structure is guaranteed.