1.Development and application of artificial muscle: Twisted fiber artificial muscle has the structure and function of biomimetic muscle. It has high strength, multiple functions and high energy output. It has important application prospects in the fields of flexible exoskeleton, prosthesis and medical health. Fiber artificial muscle can be driven by electricity, heat, light and other forms. Electrothermal and electrochemical driving have the advantages of low voltage, simple operation and easy to use. In addition, the preparation materials of fiber artificial muscle include carbon nanotube (CNT), polymer fiber, shape memory polymer, IPMC, etc. Among them, CNT has the characteristics of high conductivity and high thermal conductivity. It is the preferred material for electrically driven artificial muscle, but its cost is too high. Polymer fiber has the advantages of low cost and high strength, but its response speed is slow and its control accuracy is not high. Therefore, the development of composite fiber artificial muscle with low cost, high conductivity and high output energy density is expected to be widely used in medical treatment and flexible Rehabilitation Exoskeleton.