Abstract: Heritage libraries are nonrenewable as cultural heritage, and public as libraries. Therefore, their historic buildings are readable, and are important resources for spatial renovation and functional reorganization. Based on site and internet study, this article analyses the current condition of China’s heritage libraries in terms of their types, values and reuse, and studies the heritage libraries in UK and US. It suggests changing the mindset to explore these libraries’ value, and to improve the public understanding so as to implement their spatial renovation and functional reorganization.