In view of the lack of research in rural areas and the lack of adaptability of small watershed governance due to the focus on a single function in the existing green infrastructure system, on the basis of analyzing the internal mechanism of small watershed and green infrastructure, a three-in-one green infrastructure system of protecting the ecological environment, ensuring the bottom line of safety, and promoting green development was constructed from the aspects of connecting the upper watershed planning, changing the focus of a single function, enriching the connotation of green development, and focusing on low-cost and efficient facilities. The practical exploration of green infrastructure was carried out for the small watershed of the hill type and the prototype of peace. The practical results show that the system has high applicability to the comprehensive management of small watersheds, can effectively guide small watersheds to solve practical problems such as ecological environment and safe development, and provides a reusable planning framework and technical path for small watershed governance. Keywords: small watershed; green infrastructure; system construction; Hubei Province 〖FL