Abstract: The unique Sasui culture of Dong people comprises the psychological features,the way of thinking,behavior standards,aesthetic taste and ethic norms derived from the Sasui beliefs and worship.As a dynamic subsystem,it contributes enormously to the construction of the whole value of the Dong ethnic culture.It is also an individual secondary culture,whose sustainability depends on the cultural ecology.

Key words: Sasui culture, cultural ecology, belief；ritual；Dong nationality