Book excerpt: From the cross-disciplinary perspective of urban management and planning, geography and architecture, this book explores the theory and methods of urban memory, selecting Beijing's historic buildings, historic areas, central areas and city walls as research cases. It is divided into three parts: factors analysis, modeling and practical application. It lays a scientific foundation and provides practical methods for the management of historical spaces, residents’ and commercial activities, optimizing the layout and structure of the historic spaces, updating the protection of old buildings, promoting the organic growth of historic sites and the sustainable development of urbanization with new concepts.