The main reason of forming the multi-ethnic society is the transnational flow of migrants.By continuous immigration to Southeast Asia for hundreds of years,Chinese has deeply inlaid in the local socio-economical structure as being the ethnic group of Chinese among the local multi-ethnic society.Restricted by the structure of ethnic group stratification during the period from the colony to the new nation-states founded after World War II,the development of Chinese ethnic relationship in Southeast Asia undergoes a historical transition with the respective main aspect in different period from the interior boundary relationship among the Chinese Bangs to the exterior boundary with the indigenous people.Different periods display the different historical traits.Throughout the history,the ethnic identity of Chinese people in Southeast Asia is taking or have taken a transition progress from Hokkien,Cantonese,Hakka,Teochew,Hainanese...to the Chinese,and then to the Philippines Chinese,Malaysian Chinese,Thailand Chinese,Indonesian Chinese...and to the Filipinos,Malaysian,Thai,Indonesian...as well as the Southeast-Asia-ethnic-Chinese and Southeast Asians.Using the ethnic group theory,this paper explores the historical evolution of Chinese identity and Chinese ethnic boundary changes. <<