Abstract: A body motion is the basic unit of sports and the primary study object of sport anthropology.Body motions in sports are cultural symbols.Sport is a symbolic system which carries and expresses social and cultural meanings.An ethnic sport is a book of the history of national spiritual culture written by body motions.Chinese sport anthropology has explored and refined the analysis method of body motions in the long-term field work and study practices on Chinese traditional national sports.It is used for interpreting cultural meanings of body motions in sports.The analysis method of body motions in sport anthropology has three implement procedures as follows:1) taking photos and shooting video of authentic and complete body motions;2) participatory analyzing typical body motions;3) analyzing materials and constructing theories.Researchers can apply the analysis method of body motions to writing sport ethnography from the perspective of body movements and to investigating the interactive relationships between body motions and primitive scripts, primitive religions, primitive arts and so on.These studies will help deepen the understanding of the particular position and effect of traditional national sports in the evolution of ethnic culture.