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Island ecosystems and living conditions are undergoing rapid change as human populations are increasingly concentrated in coastal regions. Many island economies have transitioned from an emphasis on primary sector production to reliance on tourism, port, and shipping industries. This has driven processes of large-scale construction and urbanization, occasioning drastic changes in island ecosystems and enhancing the importance of understanding ecosystem service mechanisms on islands. This paper explores the spatial distribution and interactions of ecosystem services in East China's Zhoushan Archipelago and how these should affect the island's sustainable development policy. The results show that the archipelago's total ecosystem services hold great potential but that there are significant trade-offs and synergy relations, which vary on different islands in the archipelago. Cultural services are mainly distributed across the northeastern and southeastern regions, with plentiful natural scenery and Buddhist cultural heritage, which are attractive to tourists. Provisioning services show a negative correlation between cultural services and regulating services, indicating strong trade-offs between them. However, the synergy areas between cultural and regulating services might become priorities for future policies. These are mostly situated in the rural eastern part of the archipelago. The island planning policy proposed in this paper, based on the ecosystem services theory and sensitive to intra-archipelagic differences, contributes to efforts at island sustainable development by seeking to resolve tensions between economic development and environmental protection. [ABSTRACT FROM AUTHOR]