The Soft Power Theory, which was put forward by American scholar Joseph Nye at the end of the 20th century, focuses on the soft power embodied in the process of international intercourse. Archive is a kind of important resource for a state’s soft power promotion. The archives departments should fully realize their vital position along the way. What’s more, they should also give full play to archives’ unique value in the process of upgrading the national soft power. The relation between the state soft power and the archives is clarified from the three perspectives of ideology, culture and system.Then, this paper excavates the three-dimensional thrust of archives for the promotion of the state soft power from the three aspects of the identity thrust, the cultural thrust and the institutional thrust. And, the author returns to the specific links of“collection”and“application”in archival work, and explores the boosting way of archives to the state soft power promotion from two aspects of archives’ wide collection and multidimensional development.