Raman spectra of Nd-doped LiTaO3 have been studied at backscattering geometries. In comparison with those of pure LiTaO3, it is found that not only E(TO+LO) modes turned into Al (TO) modes in partial geometries but also new vibrational modes appeared and intensities of some modes changesed. We attribute the phnomena to the stronger photo- induced refractive index change and the changes ofLiTaO3 microstructure resulted from doping Nd.