Facing the prominent contradiction of unbalanced development between urban and rural areas, the 19th National Congress of the Communist Party of China clearly puts forward the strategy of rural revitalization, pointing out the direction for future rural planning and development. Although there are many concerns about the practice of rural planning at present, the research in the field of rural planning in China started relatively late, and the exploration of the theory of rural planning is less. Lack of proper guidance of rural planning concept is one of the important reasons that rural planning practice fails to play the role of revitalizing the countryside. Rural planning has become an expansion tool for market capital to penetrate into the countryside unilaterally. In this paper, the core boundary theory has been applied to the exploration of the concept of rural planning. The theory explains how the urban core and marginal areas achieve the integration of regional space through the flow of factors and the adjustment of space in the unequal development relationship. At the same time, based on the core boundary theory, the urban spatial model(the egg space model) is proposed to strengthen the core and open boundary of the rural core boundary concept, and it also puts forward the optimization strategy for the outskirts of the countryside so that the village can be adapted to the development of the times on the basis of retaining the characteristics. In terms of macroscale urban-rural relations, the optimization of rural core boundary relations is to retain the core differences of rural areas and coordinate the economic relations, cultural influences, ecological structure and interaction between urban and rural areas. In the meso scale villages and surrounding environment, the optimization of the rural core boundary relationship is to preserve the core spatial characteristics of the village, and strengthen the social connection and the traffic connection with surrounding urban space. On the micro-scale perspective of villagers' identity, the optimization of the rural core boundary relationship is to retain the traditional identity of villagers, guide the diversification of villagers' identity, and enrich villagers' life skills. Being different from the theory of urban core boundary, the discussion at the rural level emphasizes how to distinguish the core and boundary elements in the planning process, rather than emphasizing how to promote the flow of elements and space transformation between them. At present, Oucuo village, a traditional fishing village, is facing the industrial problems of occupational groups and traditional fisheries. At the same time, the anglers in Oucuo village lost their self-identity. Then the cultural context of the fishing village was broken, the regional function was degraded, and the settlement form was alienated. Its characteristics gradually disappeared, and gradually it was surrounded by cities. This study takes the example of Oucuo village in Xiamen, with the guidance of the rural core boundary concept, and puts forward strategies based on analyzing the problems highlighted in the three aspects of operation mode, cultural identity and settlement pattern. In terms of industry, through the preservation of the characteristic production mode, the introduction of cultural entrepreneurship industry and the improvement of industrial chain, the fishing village economy would be combined with the modern urban industry, which would make Oucuo village be the main carrier of urban industrial diffusion. In terms of culture, anglers' identity can be improved by preserving traditional lifestyle and culture, expanding cultural activities and promoting cultural education. At the spatial level, taking the habitat of white dolphins and amphioxus, the fishery landscape and the traditional village texture as the core, the recovery and healthy development of the fishing village mentality can be realized through the integration of farmland, the restoration of water texture, the current situation of Darning, and the transformation of ecological park. Through the investigation of Oucuo fishing village, this study combines theory with practical cases, which will help improve the theory of rural planning, guide the practice of rural planning, and provide references for the revitalization of similar villages.