The polyvinyl chloride molecularstructure had been studied by one-dimensional ATR infrared spectroscopy, second derivative ATR infrared spectroscopy, fourth derivative ATR infrared spectroscopy, deconvolution ATR infrared spectroscopy and two-dimensional infrared spectroscopy with attenuated total reflection Fourier transforminfrared spectroscopy(ATR-FTIR). Before glass transition temperature and between the frequency band700-600cm~(-1)), the band resulting from the C-Cl stretching vibration(νC-Cl) appeared...