This research attempts to analyze the changes and challenges of new Chinese immigrants in America after World War Two. At the same time, there are lots of problems and challenges from outside and inside Chinatowns. The first part is a brief historical retrospect of the new Chinese immigrants and Chinatown's traditional kinship and organizations based on Crissman's segmentary model. The second part of this work tries to explain the break-down of traditional Chinatown's organization and the new characteristics of new immigrants, such as the more balanced sex ratio, better education, skill and experience, and family-orientation. The third part tries to use a class model to analyze the new challenges of the new immigrants after World War Two. New immigrants live outside Chinatowns with only little or no connection with the traditional Chinatown organization. They enter various kinds of job market and have access to nontraditional associations. There is no pyramid organization to confine these new Chinese immigrants to an isolated and autonomous group. The familyoriented migration makes the household become a basic unit for these new immigrants to cope with different problems. From the Chinese-U.S. policy, one may develop different social webs or networks to enlarge one's contact and social activities. This part also tries to show that different adaptive strategies have been adopted by people in different ethnicities to deal with various kinds of problems in their daily life.