In recent years, extreme weather and climate events have occurred frequently, and are often compound extreme events formed by the interweaving of a variety of events.They have attracted extensive attention and research due to their serious hazards.In order to better understand compound extreme events, IPCC AR6 evaluated the latest research results of compound extreme events based on existing new evidence, and obtained some new understandings.The definition of compound extreme events is expanded.Focusing on heatwave and drought compound extreme events, compound floods and wildfires, the variation characteristics of compound extreme events are evaluated, the dependence among multiple factors of compound extreme events is discussed, the attribution analysis of the impact of human activities is carried out, and the possible projection in the future is given.These assessment results have enriched the current basic understanding of compound extreme events.However, according to the existing assessment, it can be seen that there are still insufficient understandings of the mechanism of occurrence and development of compound extreme events.At the same time, it is still necessary to further improve cross-disciplinary, cross-departmental and cross-regional research, strengthen the assessment of formation mechanism and projection of compound extreme events and their impact and risk on ecosystem, economy and society, and improve the adaptability to regional climate change in the future.