Marine national parks, integral to the marine protected area system, play a vital role in safeguarding marine biodiversity and in conserving and restoring marine ecosystems. During the establishment of national parks, stringent ecological conservation measures have inevitably constrained resource use by local residents, exacerbating the tension between ecological preservation and community development. Achieving harmonious development between community livelihoods and ecological conservation within national parks is an urgent priority in their construction. Based on the characteristics of the Changdao National Park creation area, this paper establishes an evaluation index system and objectively assesses the value of ecosystem services and the level of residents' livelihood capitals in the Changdao National Park creation area.Also uses the coupling coordination degree model to quantitatively analyze the interplay between residents' livelihoods and ecosystem services and uses correlation analysis to explore the influencing factors of the coordinated development of livelihoods and ecosystem services. The results show that: (1) There are significant differences in the livelihood capital scores among different types of residents. The livelihood capital value of the part-time fishery is the highest, followed by the tourism-oriented, the worker-oriented ranks third, and is fishery-oriented at the lowest level; (2) The total value of ecosystem services varies among villages within the research area. The ecosystem service value of villages inhabited by part-time fishery and fishery-oriented's residents is significantly higher than other types of villages; (3) In the coupling coordination relationship between livelihood and supply services, the part-time fishery has reached a coordinated development level, whereas fishery-oriented, worker-oriented, and tourism-oriented are generally at the levels of severe and moderate imbalance; (4) In the coupling coordination relationship between livelihood and cultural services, the fishery-oriented is at the level of imbalance, while the part-time fishery, tourism-oriented, and worker-oriented are all at the level of coordination; (5) In the coupling coordination relationship between livelihood and regulation services, fishery-oriented, part-time fishery, and worker-oriented are at the level of imbalance, while the tourism-oriented reaches the level of coordinated development. In light of the findings, it proposes coordinated development pathways for ecosystem services and livelihoods, targeting residents of different livelihood types of the Changdao National Park creation area. This approach is designed to address the existing conflict between ecological preservation and the socio-economic advancement of the community within the Changdao National Park, aimed to foster a harmonious balance between these two critical objectives, thereby achieving harmonious development between humans and nature within the national park.