Passive exoskeleton system doesn’〖KG-*2〗t need energy supply. The aims are to reduce physical energy consumption, protect skeletal muscles from injury in soldier loading and enhance the lightweight maneuverability and continuous combat capability. The development of passive exoskeleton system at home and abroad was summarized. The key technologies, including the design technology of humanmachine compatibility mechanism, the load transfer technology of closedloop motion chain for humanmachine, the power efficiency assessment technology and the integrated application technology of new material structure and function were analyzed. The prospect of its application in the future was also forecasted.