Abstract: The orientation of PET films uniaxially or biaxially stretched with different draw rate has been studied by means of polarized IR spectroscopy. Comparision was given for films of almost the same value of density and trans conformation content. It was found that for uniaxially stretched specimens the degree of orientation of molecular chains with respect to the stretching direction was higher than that of the biaxially stretched ones,therefore a high value of the anisotropy of molecular orientation along the film plane eculd be revealcd.An evident plane orientation of molecular plane (benzene ring plane) with respect to the film plane was observed for biaxially stretched films, but a nearly random distri-bution of molecular plane was found for uniaxially stretched specimens. The influence of draw rate as used in this work on molecular orientation was found to be negligible.