Abstract: Being an important content of human knowledge and culture，preservation of digital information resources has gradually become an important part of national information security in various countries.iPRES, as the largest and most important international conference for digital preservation, has played a positive role in promoting the global development of theory and practice of digital preservation. This article comprehensively analysises the content of the iPRES2019 from the three dimensions of diversified types of digital object, progress of key technical issues, and sustainability of digital preservation, and finally summaries the changes and development trends of digital preservation.

Key words: iPRES, Conference summary, Digital resources, Digital preservation, Complex digital objects, Key technologies, Sustainability, Trends