Desheng Sub-district has implemented the “Moral Neighborhood Project” and developed a “Moral Neighborhood Culture”，and taken the initiative to carry forward the construction of new acquaintance communities. These efforts have motivated local residents to play a role in social governance and rekindled their sense of common home. The practice of the “Moral Neighborhood Project” has contributed a fresh case and meaningful example for the research on the mechanism for rebuilding the acquaintance community in mega-city communities. With the rising urbanization rate，the development size and speed of Chinese cities have reached a level that has never appeared in the past，and some ultra-large cities and metropolises have taken shape. The traditional acquaintance society with a differential pattern based on the blood and geographical relation has gradually lost the foundation for survival and it marched toward a stranger society step by step. The urban life with a fast pace and urban population featuring rapid floating have caused a host of problems，including growing indifference in the urban society and rising management cost of urban community，while the traditional acquaintance society is more advantaged to resolve these problems. Therefore，the research on existing theories and practices at home and abroad from the perspective of differential pattern will have great significance for rebuilding the acquaintance community mechanism in modern urban communities.