泥石流是一种严重的自然灾害。从广延能量耗散的角度看 ,泥石流暴发的应力演化过程是一种自组织临界过程。斜坡松散碎屑土触变液化系统在暴雨激发下 ,内部不同因子间的相互非线性作用 ,导致斜坡碎屑土自然地朝临界极限应力状态发展 ,最终暴发泥石流。本文以应力的自组织观点 ,分析了泥石流暴发的特性。蒋家沟泥石流的资料显示 ,泥石流规模与频率间存在着幂律关系 ,这说明泥石流活动具有自组织临界的特性。 Debris flow is a serious natural disaster. From the perspective of extensive energy dissipation, the stress evolution process of debris flow outbreak is a self-organized critical process. Under the rainstorm, the thixotropic loess thixotropic liquefaction system interacts nonlinearly with each other, which causes the detritus and clayey soil to develop towards the critical limit state of stress and finally the debris flow. In this paper, the self-organizing stress point of view, the characteristics of debris flow outbreak analyzed. The data of debris flow in Jiangjiagou shows that there is a power law relationship between the scale and frequency of debris flow, which indicates that debris flow activity has self-organized criticality.