Abstract: By analyzing design parameters of powered support,this paper applied MATLAB software to developing a set of optimized design system of four-bar linkage structure of powered support.Inputting design parameters into this system with human-machine interactive interface,it realized optimized design for structure size of four-bar linkage structure and coordinate of linkage point.Four-bar linkage structure from optimized design met the need of swing of twisted-pair orbit curve and might decrease weight of connection rod.This optimized design system substituted artificial design and largely shortened design period and improved design precision.