Abstract: In this paper, the plasma coupled catalyst was used for the dry reforming of methane (DRM). The impacts of the reaction temperature, the molar ratio of CO₂/CH₄, and the concentration of the main gas components (N₂, H₂, CO, H₂O) on the conversion rate of CH₄ and the energy efficiency of plasma catalysis were observed. The results shows that the conversion rate of CH₄ is 41.57%, with La-Ni/γ-Al₂O₃ as the catalyst, the reaction temperature being 450℃ and the molar ratio of CO₂/CH₄ being 1.0, and without other gases. The conversion rate of CH₄ increases with the increase of the molar ratio of CO₂/CH₄. The conversion rate of CH₄ is 92.82% respectively during DRM by plasma catalysis, with the molar ratio of CO₂/CH₄ being 5.0. The reaction temperature and the molar ratio of CO₂/CH₄ have a significant effect on CH₄ conversion. The excited particles in the system are influenced by the changes of gas composition, which affect not only CH₄ conversion directly, but also the carbon deposition on the surface of catalyst. The addition of N₂ and H₂O in the reaction system not only improves conversion of CH₄ but also inhibits carbon deposition. The addition of H₂ and CO reduces the conversion of CH₄ significantly. The results are expected to provide basic data and reference for the development of the synthetic process of chemicals through biomass gasification.