Thermal ignition of gasoline-air mixture is one of important reasons for fire accident. So study on the reac-tion mechanism of gasoline-air mixture is of theoretical and practical significance. By the simulation study of n-heptane,iso-octane and C1—C4 detailed reaction mechanism,three main results were obtained as follows. ①The simplified mechanism of thermal ignition of gasoline-air mixture,comprising 47 components and 100 reactions,was obtained by temperature sensitivity analysis and path analysis method. ②The thermal ignition delay time decreased with the increase of initial temperature through the simulation analysis of the simplified mechanism. When the initial temperature was lower than 850,K,the delay time was longer,and when the initial temperature was higher than 900,K,the delay time was basically unchanged. ③Under the same temperature and concentration of CH,the con-centration of the components was more uniform,and the delay period was shorter. Macromolecule concentration was greater,the delay time was longer and the temperature was lower after reaction. When small molecular concentration was greater,the reaction was more thorough.%油气热着火是导致油气火灾的重要原因之一，对油气热着火发生的反应机理研究具有重要的理论和现实意义。通过对正庚烷、异辛烷和 C1～C4详细反应机理的模拟研究，得到3个主要结果：一是通过温度敏感性分析、路径分析等方法，获得了油气热着火简化机理，包含47个组分，100个基元反应；二是通过对简化机理的模拟分析发现，随着初始温度的增加，热着火的延迟时间减少，当初始温度小于850,K 时，延迟时间较长，而初始温度大于900,K 后，延迟时间相差不多；三是在相同温度和碳氢浓度下，组分浓度越均匀，延迟期越短，大分子浓度越大，延迟期越长，反应后温度越低，小分子浓度越大，反应越充分。
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