Abstract: Objective:Based on ergonomics and physical shape of children and adolescents from 7 to 18 years old,structure of stationary bike was analyzed in order to design for children and adolescents.Methods:There were 2590 children or adolescents whose physical shape was measured.According to the characteristics of physical shape,reasonable cycling posture and on the basis of Bicycle structure design principle,relative position about crank,saddle and handle of stationary bike which is designed for children and adolescents was analyzed.Results:The length of crank of the stationary bike for children and adolescents could be designed to 11.8 cm~17.7cm and the adjustable length is 5.9cm;Distance from seat to crank could be designed to 34.6cm~59.5cm;Adjustable height of seat or handle could be designed to 24.1cm;Distance from seat to handle could be designed to 54.0cm~110.4cm and the adjustable length is 28.2cm.