Abstract: The occurrence of the secondary disasters of forest fire has significant impacts on the environment quality and human health and safety. Post-fire debris flow is one of the most hazardous secondary disasters of forest fire. To understand the occurrence conditions of postfire debris flow and to master its occurrence situation are the critical elements in postfire hazard assessment. From the viewpoints of vegetation, precipitation threshold and debris flow material sources, this paper elaborated the impacts of forest fire on the debris flow,  analyzed the geologic and geomorphic conditions, precipitation and slope condition that caused the post-fire debris flow as well as the primary mechanisms of debris-flow initiation caused by shallow landslide or surface runoff, and reviewed the research progress in the prediction and forecast of post-fire debris flow and the related control measures. In the future research, four aspects to be focused on were proposed, i.e., the quantification of the relationships between the fire behaviors and environmental factors and the postfire debris flow, the quantitative research on the postfire debris flow initiation and movement processes, the mechanistic model of postfire debris flow, and the rapid and efficient control countermeasures of post-fire debris flow.