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β—环糊精的ＤＳＣ曲线表明：β—ＣＤ在２６５～３７０℃之间有一大的吸热峰，温度超过３７０℃时转化为放热峰；吸热峰对应着β—ＣＤ失去结构水（分解过程），而放热峰表明是碳与氧反应生成二氧化碳的过程（氧化过程）．本文用等温热重法和线性升温热重法在氮气气氛中研究β—ＣＤ的分解过程，运用判断机理的三步判别法对实验数据分析证明：该过程是受三维扩散机理（Ｄ４）控制．其热分解过程的表观活化能Ｅ＝１６８．７９ｋＪ／ｍｏｌ，频率因子Ａ＝１．１２５０×１０１３ｍｉｎ－１．
The DSC curves of β-cyclodextrin showed that β-CD had a large endothermic peak at 265-370 ℃ and turned to an exothermic peak at a temperature over 370 ℃. The endothermic peak corresponded to the loss of structure water of β-CD Decomposition process), and the exothermic peak shows that the reaction of carbon and oxygen to generate carbon dioxide (oxidation process). In this paper, isothermal thermogravimetric method and linear thermal gravimetric method were used to study the decomposition process of β-CD in a nitrogen atmosphere. The three-step discriminant analysis of experimental data shows that this process is controlled by three-dimensional diffusion mechanism (D4) . The apparent activation energy E = 168.79kJ / mol and the frequency factor A = 1.1250 × 1013min-1 during thermal decomposition.