Ten meter single mode silica fiber was used to study the temperature characteristics of stimulated Raman scattering (SRS), and additional peaks (double-humped structure) were observed at both sides of pump light and first-order Stokes light in the experiment. The peak intensity increased first, and then decreased as the temperature increased from 80 K to 295 K. The first-order Stokes double-humped wave peaks disappeared when the temperature was 295 K. The double-humped peaks phenomenon was caused by simulated four photon mixing (SFPM), according to stimulated four-photon mixing theoretical calculation. At the same time, the phenomenon that the frequency shift of first-order Stokes spectrum line in SRS increased from 706.9 to 712.9 cm-1 and its half width increased from 1.75 to 2.18 nm was theoretically explained, and the theoretical results are well consistent with experiments.