In the context of rapid urbanization, leveraging community capital for health promotion to achieve sustainable community development has become a critical issue. This study examines 60 communities in Taipei City through a resource inventory, application analysis, and impact assessment to explore the effects of community capital and community building on sustainable development. Key findings include: Resource Inventory: The 60 communities identified a total of 3407 resources, averaging 68.14 resources per community. These resources encompass social capital (e.g., community organizations and volunteers), human capital (e.g., professional skills and education), physical capital (e.g., facilities and venues), and financial capital (e.g., funding and grants). Resource Application: of 752 resources applied, 48.5% were for teacher matching, and 24.7% for venue borrowing, highlighting a high demand for these resources in health promotion. Regression Analysis: The results show that social capital (β = 0.35, p < 0.01) and human capital (β = 0.29, p < 0.05) significantly enhance community sustainability. Additionally, the frequency of community-building activities (β = 0.31, p < 0.01) positively correlates with sustainable development. Overall, the study confirms the importance of community capital and community building in fostering sustainable development, emphasizing the need to enhance social and human capital for community health and sustainability.