The U.S. has always keen interest in "super" efficiency of soldiers, and has taken various measures to promote the development of human efficiency enhancement technology. This paper analyzes the development characteristics, including top-level design strategic traction to deploy forward-looking layout of core areas, tasks of scientific research institutions focusing on different core directions, and investment to ensure smooth development of cutting-edge scientific research. It systematically combs the U.S. army's researches and achievements in human efficiency enhancement in terms of physical strength, skills, and intelligence. It also discusses the development trend of the field, as well as possible social legal and ethical problems and specific measures and suggestions.