利用分形理论研究灾变时矿井风流的变化规律，介绍了其分数维计算方法，得到了灾变时期井下大气各成分关联维数的动态曲线．研究发现：灾变初期各大气成分的分形维数变化趋势不同，火灾时期具有分形自相似性，火灾熄灭时出现明显的降维现象．根据这些信息可对火灾进行预测和预报，并判断灾害是否得到根治． Fractal theory is used to study the variation of mine air flow in disaster, and the fractal dimension calculation method is introduced. The dynamic curves of correlation dimension of each component in the downhole atmosphere are obtained. The results show that the fractal dimension of each atmospheric component has a different tendency during the initial disastrous phase, fractal self-similarity during the fire period, and obvious dimensionality reduction when the fire goes out. Based on this information, we can forecast and forecast the fire and judge whether the disaster has been cured.