To optimize reaction conditions and improve the reaction efficiency of catalyst ,an equi‐librium constant method was applied to study the thermodynamic influences of operating parameters , such as reaction temperature ,pressure and feed inlet composition ,on the reforming properties .The minimum feasibility temperature of the reaction was calculated to be 914 K .The results showed that the methane conversion increased with temperature and decreased with pressure .At 1 123 K ,the con‐versions of CH4 and CO2 achieved 94 .47% and 97 .31% respectively .When the molar ratio of CH4 and CO2 increased ,the conversion of CH4 and CO2 appeared a drab but opposite change tendency ,when molar ratio of CH4 and CO2 is 1 .2 ,CO2 conversion rate reached 99 .29% and molar ratio of H2 and CO was 0 .99 .By the introduction of oxygen ,the conversion of CH4 increased ,but that of CO2 re‐duced ,and the molar ratio of H2 and CO increased .When the molar ratio of CH4 ,CO2 and O2 was 1 .2∶1∶0 .575 ,auto‐thermal reaction could be realized .%为了优化反应条件及提高催化剂的反应效率，采用平衡常数法对甲烷二氧化碳重整制合成气进行了热力学分析，计算出该反应发生的最低可行温度为914 K。研究了反应温度、压力及反应原料进气组成对重整特性的影响。结果表明，温度在1123 K和常压下，CH4和CO2的转化率可分别达到94．47％和97．31％，且温度升高有利于转化率的提高，而压力升高却不利于反应正向进行。随着原料气中 n（CH4）／n（CO2）比值的增加，CH4和CO2转化率呈现单调但相反的变化趋势，当 n（CH4）／n（CO2）＝1．2时，CO2的转化率可达99．29％，n（H2）／n（CO）为0．99。O2含量增加，使CH4和CO2转化率分别升高和降低，且使 n（H2）／n（CO）的值增加；当 n（CH4）∶ n（CO2）∶ n（O2）＝1．2∶1∶0．575时，能使反应实现自热。
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