Background and Aim: The development of national traditional sports is of great significance to social development, economic growth, cultural exchange, and other fields. Nowadays, with the opportunity of the "Belt and Road" cultural exchange construction, Chinese traditional sports culture is accelerating communication and exchange, and at the same time, it also attracts many excellent national traditional sports culture and culture along the line, enhancing the diversity of national traditional sports culture. However, due to the complexity and diversity of traditional national sports culture exchanges and the long-term construction of the "Belt and Road" project, it is necessary to insist on the sustainable development of traditional national sports culture. Materials and Methods: This research belonged to the field of sports sociology, mainly using questionnaire surveys, expert surveys (Delphi), mathematical statistics, etc. The population includes 15 experts in Sports Management, Traditional ethnic sports, Sports humanities, and sociology, “NADAM” organizers, and “NADAM” professional participants. In this study, experts are selected by purposive sampling. To construct The Development of a Sustainable Model for Promoting Chinese Traditional Sports “NADAM” under the Background of The Belt and Road, the researcher will conduct the following operations: Step 1: Collect relevant data and determine the first draft of indexes. Step 2: Invite 5 experts to evaluate and check the draft of a model for promoting Chinese traditional sports “NADAM” under the background of The Belt and Road. Step 3: Use the Delphi method to build a model for promoting Chinese traditional sports “NADAM” under the background of The Belt and Road. Step 4: Check on the suitability and feasibility of the model for promoting Chinese traditional sports “NADAM” under the background of The Belt and Road. Step 5: Summarize and report the content of the model for promoting Chinese traditional sports “NADAM” under the background of The Belt and Road. This study mainly used SPSS 22.0 for data analysis. Results: (1)Policy support played an important role in protecting and promoting the sustainable development of NADAM. While institutional support was also important, policy support was more critical in terms of overall impact and sustainability. National policy support, local policy support, and legal and regulatory support should complement each other to form a comprehensive framework to promote the sustainable development of NADAM. (2)Economic support and economic level were important factors in the development of NADAM. Economic support provided the necessary resources and funds to help expand the scale and optimize the organization of the festival. The economic level determined the overall strength of the community and people's ability and willingness to participate. (3)Management consciousness usually had a greater influence on the development of NADAM. The ability and efforts of the managers were essential to ensure the scale and quality of the NADAM. They could consider the positioning, goals, and strategies of NADAM from a global perspective, and guide the inheritance and development of NADAM. To lead NADAM towards sustainable development.(4)The mode of communication and the level of scientific research had an important impact on the development of NADAM, and the appropriate mode of communication could promote the cultural inheritance and promotion of NADAM, expanding the scope of influence of NADAM. Scientific research could promote the innovation and improvement of sports technology in NADAM. Through scientific research, we could deeply understand the history, skills, and cultural background of NADAM, and explore innovative forms of expression and artistic techniques. Conclusion: Policy support plays an important role in protecting and promoting the sustainable development of NADAM. Providing adequate financial support, NADAM can be better organized and prepared, economic support can promote the development of NADAM-related industries. Management consciousness usually has a greater influence on the development of NADAM. An effective communication model can attract tourists and audiences to participate in NADAM activities.