Abstract: The study briefly summarized the development process of modern silk reeling industry in China, and summaried the historical evolution of Yongtai Silk Factory. It expounded the heritage value of the silk factory site and main buildings. Based on the literature review and on-site survey, the environment and building overview of Yongtai Silk Factory before regeneration were analyzed, and the conservation and regeneration measures and methods of the factory environment and building were summarized. On this basis, the typical case in the silk factory conservation building-cocoon warehouse building was selected, its characteristics of basic dimensions and facade form, spatial form and structural system were interpreted, and the protective repair methods of the cocoon warehouse building were analyzed.