Raman spectra of methanol and the aqueous solution have been observed, of which the former with regard to the effect of temperature change and the latter with regard to the effect of concentration change and of aging have been investigated. From the change of structure and frequency of Raman bands, it has been concluded that methanol molecules associated with each other do not show frequency shift of the band, C-O vibration, but the molecules hydrated in aqueous solution give the frequency decrement due to increment of proton density making hydrogen bonds and that the hydrogen bond between methanol and water molecules is stronger than that between methanol molecules each other.