The original project site was an abandoned leprosarium that had lain dormant for many years. The design site was dilapidated, overrun with weeds, plagued by stagnant water, and its ecological environment severely damaged. Despite the abundance of trees, the atmosphere was bleak and decaying, and neighboring residents avoided the area. We first systematically restored the water environment surrounding the site, adding a pier that allows boats to access neighboring communities. The design respects the architectural ruins as much as possible, utilizing existing structures for reinforcement, renovation, and reuse, without compromising the existing tree plantations, thus minimizing disturbance to the site. The application of sponge ecology and soil improvement techniques further enhances the ecological quality. After the transformation of the leprosarium site, it has been transformed into a wetland civic garden with a typical Jiangnan Garden style, boasting various public functions such as classrooms, exhibition hall, activity rooms, conference hall, multifunctional hall, guest rooms, and cafes. It also provides a favorable habitat for animals.