Social construction is one of the major aspects of modernization construction in contemporary China, as well as one of the difficulties and focuses in this process. To some extent, the sociologists in China have reached a consensus about the internal connection between civil society organization and social con- struction. As a form of civil society organization, the civil charity organization in China embodies the necessity and inevitability of the participation in social construction. The civil charity organization in China plays an important role in the development of public areas of social service and the expansion of private space. Among these organizations, religious charity organization is an integral constituent. Compared with the secular charity organizations, religious organization has its peculiarity, apart from its ordinary cha- racteristics of public welfare. Take Beijing RenAi Charity Organization as an example. From the case study of this organization, the exploration and practice of religious charity organization in social construction are clearly presented. The connection between Beijing Buddhist charity organization and social construction is also explored, which aims to provide evidence to the necessity and inevitability mentioned above, and to practically promote social construction. Theoretically, this exploration has some creative significance to the sociology of religion and the theories of social construction.