As a typical coastal city, Xiamen, Fujian Province, China, faces serious societal challenges such as the impact of climate change, overexploitation of natural resources, and loss of biodiversity. Xiamen is implementing Nature-based Solutions (NbS) by strengthening ecological protection, promoting ecosystem restoration, building sponge city, supporting sustainable community development and green transformation of mines, while encouraging funding and diverse public participation. After more than 30 years of exploration and practice, the green development concept of harmonious coexistence between man and nature has been integrated into areas and processes of Xiamen’s economic and social development, making Xiamen’s practice a global example of excellence in NbS and a model for sustainable development of coastal cities.