It is an inexorable trend that public information services will bring about massive data aggregation and correlation in Big Data era. Based on the introduction of archival social memory theory and its practices, the conception of cross-organizational aggregation of digital social memory resources is proposed, the theoretical foundation and game pattern are analyzed. Moreover, a kind of strategic framework model for digital memory aggregation, which based on digital collaboration mechanism of archive, library and museum, is set up and its technical realization is also discussed. In a word, the research conclusion of this article is meaningful for archival services expanding in Big Data era.