The Wind-prevention Festival is a unique custom of the Yao nationality in Wantian Village of Lingui County in Guangxi Zhuang Autonomous Region,whose origin is related to the Yao’s bitter memory of sailing across the sea,their worship of wind and their suffering from wind-disasters.Through the evolution from one of the Yao’s taboos to a festival attended by other ethnic groups,the Wind-prevention Festival is the result of cultural interaction among different ethnic groups and embodies the impacts on the construction of regional cultures by the migrating groups.This unique festival is a miniature of the changes in the ethnic relations and cultural forms along the Nanling Ethnic Corridor,and also a typical case for anthropological research on "floating population".