Mechanical exoskeleton can usually be mixed with power exoskeleton, which is a wearable power equipment. . The hard shell on the body surface of arthropods such as beetles and shrimps is the exoskeleton, which mainly plays the role of protection and support. Powered exoskeleton refers to those self-powered and wearable mechanical devices that can turn infantry into armored combat vehicles or bring amputees or the elderly back to life. As early as 1960, General Electric began to study mechanical exoskeleton, but the equipment they developed at that time only had one hand. MIT (Massachusetts Institute of Technology) has also started research from 1978, but XOS developed by Raytheon, a contractor of the US Department of Defense, looks promising and is expected to conduct battlefield experiments in the next few years. Compared with Lockheed Martin's recently launched "human load-bearing exoskeleton", XOS is more powerful. In addition to military use, powered exoskeleton is also promising in the civilian field. HAL was developed by Yoshiyuki Sankai, a robotics expert at the University of Tsukuba in Japan, and his colleagues. It is the abbreviation of Hybrid Assistive Limb, which is mainly used in the medical field to help the disabled move and the wounded recover, as well as to help nurses. There are already products on the market. A dynamic exoskeleton developed by A&M University in Tokyo, Japan, aims at the elderly market, hoping to help them complete some manual labor.