The objective of this study was to investigate the effect of feed composition, space velocity, and reaction temperature on methane/carbon dioxide conversion and H₂/CO ratio. Independent variables were feed ratio, flow rate, and reaction temperature while CH₄ conversion, CO₂ conversion, and H₂/CO ratio were set as dependent variables in the complex reaction of methane. As a result of mixed reforming reaction of methane through RSM modeling method, the reaction temperature was found to have the greatest influence. This is because the reaction temperature has the greatest influence on the reaction rate and equilibrium state as a factor directly affecting the thermodynamic value of the catalyst.