应用突变理论对火灾灾变时井下大气性状的变化过程进行了研究，建立了灾变过程大气性状的突变模型。该模型的分析结果与实际情况一致，利用这一突变模型可确定防治火灾的各种有效措施，确保矿山安全生产得以顺利进行。 The catastrophe theory was used to study the process of the downhole atmospheric character during a catastrophic fire disaster, and a catastrophe model of the atmospheric character of the catastrophic catastrophe was established. The analysis results of this model are consistent with the actual situation. By using this mutation model, various effective measures to prevent and control fire can be determined to ensure the smooth operation of mine safety production.