Based on the fieldwork and historical data and Fucault s theory and from the anthropological perspective of looking at the center froma marginal position, the author studies this group living on water at three historical periods and their different names and relevant discourses and reinterprets the formation and nature of“discrimination against the Dans” as well as its implications to China s.

The crime of instigating ethnic discrimination is a criminal offence which violates the right of ethnic equality,that is,a violation of the political,economic and human rights of some individual or a special group.

Democracy can be categorized as the discriminatory democracy and the nondiscriminatory Democracy,but the orientation for the development of democratic politics is towards the nondiscriminatory Democracy.