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[Purpose/significance] The mass digitization of the print collection is an inevitable action for digital libraries. It has enlarged the depth and breadth of library services, and has enormously promoted the development and progress of academic exchange and academic research. [Method/process] This paper analyzed the global mass digitization of the print collection in terms of the origin, environmental factors, development status and current problems. It took HathiTrust as a case study. [Result/conclusion] Building the principles, solving the copyright problems with fair use and establishing a multi-stage and multi-sided framework for cooperation are important measures to promote the full realization of the mass digitization.