The low Raman gain of ordinary single mode fiber severely restricts the development of the Raman amplifier. Therefore, the development of high Raman gain fiber had important significance. This paper studied the Raman scattering enhancement properties of PbS-doped silica fiber. PbS-doped silica fiber and ordinary single mode fiber samples were prepared by modified chemical vapor deposition(MCVD) and their transmission loss spectra and Raman spectra were measured. The experimental results showed that the PbS-doped silica fiber had stronger Raman scattering intensity. Under different pump power conditions, Raman amplification experiments were carried out. Compared with the ordinary single mode fiber, the PbS-doped silica fiber had larger Raman gain.