Taking the jellyfish as the research object,the umbrella water jet propeller driven by SMA wires was designed by imitating its jet propulsion. Firstly,through studying the morphological characteristics,the mode of motion and the muscle structure of jellyfish were analyzed,the mathematical model of action characteristics and propulsion of jellyfish umbrella body was established. Secondly,the muscles structure of the jellyfish umbrella body was modularly designed,the action unit driven by SMA wire was develop...