In order to obtain high Raman gain special quartz fiber and increase t he gain of Raman fiber amplifier, the Raman scattering enhancement properties of lithium niobate (LiNbO₃) doped silica fibers were investigated.The LiNbO_3doped silica fiber samples were prepared by modified chemical vapor dep osition (MCVD) with a transmission loss of 5dB/km at a wavelength of 1550nm.Raman spectra of LiNbO_3doped silica fibers were measured and compared with those of conventional single mode fiber s with the same length to obtain larger Raman scattering intensities.At several major peaks,the Raman scattering intensity of the LiNbO_3doped silica fibers is 3.8~4.8times of that of the conventional single mode fibers.A t the same time,a Raman fiber amplifier system was set up,and the Raman scattering amplification gains of LiN bO_3doped silica fibers and conventional single mode fibers were measured.The experimental results show tha t the gain of Raman amplification of LiNbO_3doped silica fibers is about 2times of that of conve ntional single mode fibers.Therefore,the LiNbO_3doped silica fiber as a Raman fiber amplifier gain medium will be able to replace the conventional single-mode fiber,and can effectively enhance the amplification effect of Rama n fiber amplifier.