Abstract: Scaling relations between the energy of stimulated Raman scattering (SRS) and that of incident laser light for a few target configurations are experimentally investigated. The generation condition and evolution of SRS is revealed. The results show that SRS in Hohlraum targets is the dominant mechanism to produce suprathermal electrons. Spectra of SRS range from 1.2 to 2.1μm and Anti-Stokes light generated by 1.053μm laser light is observed. From the short wavelength cutoff of SRS spectra we deduce the electron temperature in plasma corona to be 1.35keV. And also using the spectra we find that SRS occurs in an electron density region from 0.07 to 0.15n.with its peak at 1.5×1020/cm³.