Abstract: [Purpose/Significance] Beijing，as a first Dual Olympic city in the world , has created an Olympic legacy of unique value. Valuing, protecting and promoting Beijing Dual Olympic legacy is a major issue worthy of study and action. [Design/Methodology] This research uses literature research and case study methods. Firstly, it collates the concept and action development of Olympic legacy, and summarizes why digital preservation and dissemination of Olympic legacy is necessary and beneficial. Secondly, it analyzes the projects of Olympic legacy digitization in China and other countries, and explores the dilemmas they face. Finally, it takes the digital exhibition hall of "Beijing Memory : Dual Olympic City" as an example to discuss the application and prospects of digital preservation and dissemination. [Findings/Conclusion] The digital preservation and dissemination of Dual Olympic legacy has significant advantages in terms of risk resistance, accessibility, dissemination power and value-adding.At present, there are the problems of inertia, confusion, lack of platform and negligence in operation and maintenance.A set of systems, standards and methods, formed in the "Beijing Memory : Dual Olympic City" digital exhibition hall help to launch Beijing's experience in popularizing Olympic knowledge and spirit and promote the implementation of the Legacy Strategic Approach in the digital era. [Originality/Value] The digital preservation and dissemination of Dual Olympic legacy will create precious digital assets both for the international Olympic games and Beijing memory, establish an Olympic legacy community in cyberspace, and realize barrier-free sharing for the global public.

Key words: Olympic legacy, Digital preservation, Digital dissemination, Beijing Olympic Games, Digital exhibition hall, Digital humanity