Chapter One.Introduction 1.1.The Significance of the Thesis Cultural identity is important in intercultural communication，because a persons cultural identity exerts a profound influence on his or her communicative style and there are cultural differences in the structures of expectation to identity. When people from different ethnic or cultural background come in contact，cultural differences and historical and economical disparity between these cultural or social groups Can easily lead to stereotyping，prejudice，discrimination，ethnocentrism， which are serious pronems to effective intercultural communication. Sometimes cultural conflicts occur.among which identity conflict is one of those intractable conflicts.So，it is important for people to appreciate what constitutes membership in the cultures and how that membership might influence the manner in which people approach，perceive，and interact with other cultures. 1.2.The Purpose of the Thesis This thesis is the study of cultural identity of sonic minority or marginalized social groups.The author describes stereotypes，prejudice，discrimination based on those identities，analyses their formation from the cultural，social.political and historical perspectives and their negative effects on intercultural communication,in ordder that we can develop our sensitivity to cultural diversity and cultural differences and find out some practical approaches to effective intercultural communication 1.3.The PractieaI Value of the Thesis Cultural identity is a controversial issue all around the world. Cultural diversity has become a fact.Cultural diversity is considered as one of key phenomena shaping the contemporary world and greatly enhances sensitivity to cultural identity.Today,in an age when discrete cultures themselves are under threat.the question of cultural identity becomes newly problematic and takes on new urgency.People become more and more concerned about the uniqueness or the particularity of their own culture.National governments that promote multicultural，multiracial harmony like Singapore，or the United States，in fact eahance ethnic separateness by constantly drawing attention tO“racial”,or“ethnic”identities. Contemporarily or in the long run，to preserve and promote cultural identities and to discover their traditional value and adaptive function can achieve the harmony of multicultural or multiethnic societies，and eventual integration and assimilation of cultures，whether on the global level or on the local level.So，the study of cultaral identity in this thesis embodies great practical and historical value.1.4.Methodity Theoretical and methodological developments of recent decades have transformed anthropology by situating local ethnographic researches within larger systems of power,and by focusing attention on the complex relationships between local communities and larger-scale structures within which these communities are embedded.Studying multi-level，multi-sited research problems is undertaken through the local setting but frames them in terms of global issues and often incorporates ethnographic experience elsewhere.Sociocultural and linguistic anthropologists share a study of many key phenomena and critically analyze and theorize these phenomena through ethnographic investigation of contemporary social, cultural，political，economic，and communicative processes. This thesis is to study communicative problems based on some cultural identities in intercultural communication.The author develops this study on the basis of sociocultural，anthropological and ethnographic approaches.The study of communicative problems in this thesis is carried out both on the global level and on the local level through analysis of social，cultural，political and historical processes The ethnographic approach emphasizes that cultural identity and communicative practices must be understood as situated within historically shaped systems of power and value，from local to global levels of analysis，through the politics of cultural identity and other forms of collective action related with it，such as social justice.anti-racist，feminist，environmental，language，religious，ethic and other movements.