Raman spectra of collagen and DNA were discussed at different temperatures. The temperature-dependence of Raman intensity was obtained in the region from -150 to 200 degrees C. Four denaturation points at 0, 40, 68 and 90 degrees C of collagen and two peaks at 38 and 82 degrees C for DNA were obtained. The wavenumbers of many vibrational modes were found to increase for lower temperature, but the peak at 1302 cm(-1) of collagen and the peak at 1101 cm(-1) of DNA showed the opposite trend. In all of the vibrational modes of DNA, the bases showed the most sensitive to different temperatures and there is a pronounced shift of bands at 70 degrees C, the starting point of denaturation.