The Path of Rural Social Capital Improvement in China from the Perspective of Planners: A Case Study of Hongtang Village in Yunnan Province

China’s rural areas have long been backward in development, and many villages have completed poverty alleviation with the help of the government. Facing the requirements of sustainable development, it is necessary to change the development path, continuously increase social capital, and effectively connect with government investment resources. The existing research and practice mostly construct the strategy of social capital from the inside of the village, lacking interaction with the superior government. This paper argues for the method of planners’ intervention. The advantage is that it links the power of government and villagers, creates a perceptible, experiential, valuable material environment, and promotes collective action. Through this process, the knowledge interaction and social relations in the village can be improved. The purpose of this paper is to study how participatory planning affects the content and mechanism of this process mentioned above. Taking Hongtang village as a case study, we analyze the in-depth changes that participatory planning has brought to the rural space and social level. In the participatory planning practice of Hongtang village, college rural planners took a small vegetable garden as the breakthrough point to stimulate villagers’ participation. In the process of the upgrade, planners evolved the interaction between the village committee and villagers in the path of IMEE, which is “Intervene, Motivate, Enable, Empower”. Moreover, planners always maintained contact with the higher-level government. Through the upgrade of small vegetable gardens, the villagers’ initiative was brought into practice, the social capital was fully explored, and an effective link with the government’s resource allocation was realized.