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Digital information is instable and easy to be lost. With the rapid development of information technology, the hardware and software used to read digital data become obsolescent soon, while a lot of information in these unreadable data is so valuable for businesses and professions that it is urgent to be preserved for long-term utilization (or "digital preservation"). Since 1980s, there have been a lot of related research projects. However, there is no sound platform to provide an experiment and verification environment for the research of Digital Preservation. By utilizing a series of open source software, this paper proposes a DSpace-based digital preservation experimental platform - THDP, which follows OAIS reference model. This paper also suggests several new functions like Automatic Obsolescence Management System.