The National Archives and Records Administration released the first strategy for preserving digital archival materials in the August of 2017. NARA dominated the formulation of the strategy, which focused on digital archival materials rather than any other kinds of digital materials, breaking the limitation that the traditional preserving strategies have always been made by library or intelligent institutions. With the aware of the significance of this strategy in the field of archival preserving, this paper conducts textual research on the strategy and relevant policies in NARA. It analyzes on the strategy background and concludes the detailed content into strategy map, macro and medium strategy, in order to find the strategy formulating experience in America and to inspire the future strategy for Chinese digital archival preserving.