An accident root-cause analysis report is a detailed document that involves in-depth research and analysis of the accident process, identifies the underlying causes of the accident, and proposes effective improvement measures to prevent such accidents from occurring again. The five aspects of root cause analysis refer to the use of five different approaches in the process of investigating accidents in order to identify their underlying causes. These five aspects include environmental analysis, management analysis, equipment analysis, personnel analysis, and procedural analysis. Environmental regression mainly refers to identifying the impact of environmental factors at the time of an accident, such as weather, temperature, humidity, etc ; Management regression refers to the analysis of problems in the management system, management processes, and managers at the time an accident occurs ; Equipment regression refers to the analysis of issues related to the quality, use, and maintenance of the equipment and instruments involved in an accident ; The return of personnel involves analyzing issues such as staff competence, training, and cultural background ; Program regression involves analyzing issues such as program standards, specifications, and procedures at the time an accident occurs. Through tracing and regression in five aspects, it is possible to comprehensively and systematically identify the causes of an accident, and take effective measures for improvement in order to prevent such accidents from occurring again. .