A normal mode analysis of syndiotactic poly(l-butene) of form I having (TTGG)(2) conformation was made in accordance with the valence force field derived by Holland-Moritz for isotactic poly(1-butene) of form I. The assignments were made successfully using polarized infrared and Raman spectra. Based on the assignments, spectral characters in the melt and the low temperature were investigated. The infrared and Raman spectra did not change in the melt but the CCH bendings of the spectra in the low temperature were sensitive to the conformation.