Abstract: The changes of folk sports are common phenomenon. The exploration of the interactional relationship in many dimensions between its changes and outer environment is important to its future development. A case study shows that human pyramid in Yecun Village derives from the religious culture in traditional society because the transition of the contemporary society leads to the change of cultural ecological environment which compresses the survival space and further causes the deviation of such folk culture into the track of cultural market. Meanwhile, the expressional form of its cultural connotation experiences great changes. The research believes that the transition of folk sports is the choice of survival in cultural ecology and the environmental changes of cultural ecology are its reason. The change of human demand motivates the transition of folk sports and the transition of folk sports is a combined course of "anomie" and "regulation". The development of folk sports has to abide by the rules of ecological evolution.

Key words: folk sports, cultural ecology, change, human pyramid