Research on the Construction of a Sustainable Development Assessment Model and Long-Term Protection Strategies for She Ethnic Minority Song and Dance Culture

She ethnic minority song and dance culture carries important ethnic memory and cultural genes, but its sustainable inheritance is challenged by discontinuity of transmission, declining youth participation, aging inheritors, and excessive commercialization. To construct a scientific assessment and protection framework, this study develops a three-level sustainable development evaluation index system using the Analytic Hierarchy Process and fuzzy comprehensive evaluation. The system contains four primary dimensions, twelve secondary indicators, and thirty-six tertiary indicators covering cultural transmission capacity, social participation, economic sustainability, and ecological harmony. Field research in eight She ethnic minority regions in Zhejiang, Fujian, and Jiangxi produced 768 valid questionnaires and in-depth interviews with inheritors. Grey relational analysis identifies the proportion of inheritors under 40, youth participation rate, and skill integrity score as the strongest factors affecting sustainability. On this basis, a protection mechanism combining government leadership, community participation, and market regulation is proposed. Digital inheritance platforms, multimedia archiving, wireless communication, and optical imaging can further support long-term monitoring and cultural dissemination.