Abstract
In the process of rapid urbanization, gentrification and commercialization have inevitably appeared in the historical districts of Jiangnan. Although they optimize the space environment of the historic district and promote the development of economy and tourism, they have resulted in disadvantages such as insufficient vitality of the space group, rigid space interface, lack of space quality and lack of regional culture. Mathematical calculation can be used to analyse the data of 15 historical blocks, determine the key points of the protection of historical blocks in Jiangnan area and then put forward reasonable construction strategies. This paper starts from the four elements of space group, space structure, space quality and space vitality dentifies the key points and key point of the historical block protection in Jiangnan area, and then puts forward the reasonable place building strategy.The Yangtze River Delta region has a long history and strong local characteristics. The visualization of theblock image can not only improve the connotation and appearance of the city, but also cater to guests from all over the world and promote the development of the tourism market. A prosperous tourism market and a consumption environment enable historic and cultural cities to display their charm unprecedentedly and promotetourism economy to a new level. Under the development condition that the urban development mode turns to“stock optimization”, the historical block that preserves the massive historical information and real life of the city is bound to become the “rich and refined inner space of the city”, which is repeatedly emphasized by Premier Li. The revitalized historic districts in the Yangtze River Delta continue the historical context of each city,maintain the spiritual world of urban people and shoulder the urban mission of “storing culture”, “spreading culture” and “creating culture”, just like “sowing new seeds of vitality on barren land”.
