The theory of polarized development is one of the most important theories in studies of regional developments, and frequently used by many countries, including developed countries, to formulate their regional development planning. The practice of polarization development strategy in Shanghai's Pudong New District has made the district become a convergence place of various productive factors such as capital, technology, labor force, enterprise and industry. Meanwhile, the polarized development makes population, as the most active factor of social and economic activities, largely move to Pudong New District, and forms the population spatially gathering, redistributing and residential difference of various groups. It also produces many social effects such as community reconstruction, social polarization, social segregation and stratum contradiction. These social effects will influence social and economic sustainable developments of Pudong New District.