Stimulated Eaman scattering effect in hydrog en and methane mixture is investigated, using the frequency-doubled output (532nm) of a Nd3+: YAG lasers as the pumping source. For different ratios of the mixture, both SRS lines and combina-tions (V = VP + ) of H2 and CH4 are observed by an optical spectrum analyser (OSA WP-4); and shifts of SES lines are found. It shows suppression and coupling between hydrogen and methane in the mixture. A preliminary explanation about the experimental results is discussed in the paper.