|（1.Laboratory of Laser Sports Medicine，South China Normal University，Guangzhou 510006，China；2.Scientific Research Institution of Military Sport，Beijing 100072，China；3.Guangdong Vocational Institute of Sports，Guangzhou 510663，China）
Abstract: The authors gave an overview of researches on relations between the ratio of index finder length to ring finger length (2D to 4D) and sex hormone, gender, race, age, perception ability and sports capacity. The ratio of 2D to 4D is determined at the early stage of development, characterized with gender dimorphism (male’s ratio is sig-nificantly lower than female’s), and considered as a useful index for showing the functions of testosterone prior to birth. Current experimental results hinted that the ratio of 2D to 4D may positively correlative with sports potentials, and that outstanding athletes have a lower ratio of 2D to 4D. The authors suggested using the ratio of 2D to 4D in athlete selection.
Key words: sports physiology；ratio of index finder length to ring finger length；sports capacity；sex steroid hormone；overview