将甲烷水合物的分解过程看作球形颗粒消融问题，采用宏观气固反应动力学方法，建立了恒温减压条件下水合物的分解动力学模型，推导了甲烷水合物的分解速率方程。采用实验数据进行动力学分析，认为在℃以下，水合物分解速率由气体在冰层的扩散过程控制。通过对比甲烷气体在冰层内有效扩散系数的模型计算值和实验值，对模型进行验证，误差分析表明，所提出的甲烷水合物分解动力学模型计算结果与实验值吻合良好。

Taking methane hydrate decomposition as a particle shrinking process, this paper has built a dynamic model for methane hydrate decomposition under the conditions of decompression and uniform temperature by macroscopical gas-solid reaction dynamic methods,and has deduced an decomposition rate equation. Experimental data and their dynamic analysis indicated that decomposition rate was controlled by pervasion process of gas in the ice layer below zero centigrade temperature. By comparing effective diffusion coefficients of methane in ice layer between the calculated one by our model and experimental data aiming to verification of the model, it was shown that results from the model matched experimental data perfectly, which means the high reliability of the model.