The social capital in archives is a kind of important resource to enhance the archival public service capability, and the stock of social capital has the boosting function to improve the public services. In the course of upgrading the archival public service capability, it is necessary to complete correlative system actively, strengthen publicity and education and innovation the public services model. Meanwhile, it also need to rely on the positive function of social organizations, and to make every efforts to promote the social capital stock in archives at all levels, only in this way could lay a solid foundation to promote archival public services level.