Abstract:The deep-sea AUV/ARV is an important technical equipment for hadal scientific research, engineering and military applications. Focusing on the AUV/ARV with maximum operating depth of 6000 meters or more, the research status and application fields of the deep-sea AUV/ARV are introduced, the key technologies such as overall design and integration, deep-sea structure and materials, high-efficiency energy power, high-speed underwater communication, combined positioning and navigation, and autonomous sensing and control that need to be broken through are analyzed, and the future development trend is prospected.