Abstract: The structure and properties of fiber of IPP (Z30S) blent with different content of chemical degrading modifying adduct have been studied by the way of density, velocity of sound, Xray diffraction and stressmeter. The effects of chemical degrading modifying adduct on the texture of PP fiber were discussed. The effects of tiemolecule on shrinking stress of the fiber and the effects of spinning speed on its texture were analyzed.