| Raman scattering can be classified into linear Raman scattering and nonlinear Raman scattering. One of characteristics of the nonlinear Raman scattering is existence of multi order Stokes spectral lines and multi anti-Stokes spectral lines in the Raman scattering process. Highlight nonlinearity can be explained by two energy level atom model, but weak light nonlinearity has to be explained by four energy level atom model.Intensity of the Raman scattering can be enhanced 10~3 times using liquid-core optical fiber technique. Benzene was injected into 10m hollow optical fiber to make benzene liquid-core fiber. The nonlinear Raman scattering in the benzene liquid-core optical fiber has been studied in this paper, using 2 milliwatt CW He-Ne laser as light source. In the benzene liquid-core optical fiber multi order Stokes spectral lines and multi anti-Stokes spectral lines were observed under the action of the weak light, these spectral lines show weak light nonlinearity in liquid-core optical fiber.Observed Spectral lines produced by four-wave mixing in the liquid-core optical fiber were analyzed in this dissertation.
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