摘要：Properly solving the relationship between conservation and devel-opment is one of the important requirements in the development of historic urban. The author approaches the issue through case studies of the old Quarter, a special historical sites of Hanoi capi-tal. The process of urbanization and urban development has af-fected and made Hanoi Old Quarter (HOQ) many changes. How to maintain HOQ has been studied by many scientists. Some of the results of those studies have been applied in practice. Howev-er, the results are still moderate. This study focuses on compre-hensive review of the features of HOQ and its transformation in both tangible and intangible aspects. The author used the field survey method and secondary data for research. The results of the study have shown the characteristics of HOQ along with its changes in the aspects of economy, culture, society, science-technology and architecture-planning. The current status of HOQ is: Population density is too high; altered traditional functions; space, architecture and landscape are deformed and its characteristic elements are gradually lost; polluted environment, technical infrastructure are overloaded. The article al-so discusses the direction to maintain and develop HOQ as a his-torical sites without hindering the development of smart and sus-tainable urban development..
