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A large amount of experimental data for methane adsorption capacity in shale are available and the Langmuir model is capable to describe most of these adsorption isotherms. Two parameters used in the Langmuir model are the Langmuir pressure constant P_L and the Langmuir volume constant V_L. However, experimental data also demonstrate that the gas adsorption capacity of shale is greatly affected by temperature and the classic Langmuir model, with temperature independent V_L and temperature dependent P_L, could not well interpret the experimental data. This is partly attributed to the isosteric heat of adsorption, which makes V_L vary with temperature. The change of V_L with temperature for gas adsorption in shale and its dependency on shale properties are still not well understood. In this study, the variation characteristics of V_L with temperature for gas shale are investigated through a modeling analysis …