The practically measured Fourier infrared absorption spectra of heroin and opium have been given. On the basis of the absorption peak sites, the fundamental phonon energies of heroin are calculated: ELO=0.0486, ETO1=0.0555, ETO2=0.0616, ELA=0.0257, ETA1=0.0097, ETA2=0.0134 eV. All of the Fourier infrared absorption peaks of heroin, consist of these elementary phonons by different combination.