**4. Conservation Strategies for the Sishengci Historic District**

As a carrier of urban heritage, the systematic conservation, utilization, and inheritance of historical and cultural heritage in urban construction are of great significance to the continuation of the city's history and culture and the promotion of urban development. When carrying out district conservation, it is possible to refer to the syntactic model data to understand the district characteristics. Here, the example of the Sishengci historic district in Chengdu is used as a reference for the conservation of historic districts.

(1) Conservation of the core area of the district. A long-term practice called conservation works to prevent harm to a building's or area's unique character. It is a deliberate process that, over time, maintains little change. According to The Burra Charter, conservation refers to all actions taken to safeguard a location in order to maintain its cultural relevance [34]. The term "conservation" encompasses all aspects of preservation together with interventions of every sort, including restructuring, revitalization, restoration, and regeneration. The historic district has a long history and preserves a splendid architectural heritage. The core of these historic districts' overall space is Xinglong Street, Huaxingshang Street, Huaxingzheng Street, Huaxing East Street, Fanku Street, Rushian Street, Fuzi Street, and Wangfu Street, which is the crucial object of the district's protection. Chengdu, as a historical city, has carried out region-wide tourism in recent years, which has caused a certain impact on the conservation of historic districts. According to the spatial axial lines analysis, the complete preservation of the local and overall core areas should be firmly ensured so their spatial forms are not destroyed, and the core influence of the cultural sources is brought into play. Under the premise of conservation, the tourist flow should be adequately controlled to avoid destroying the protected area space and architecture.

(2) Emphasis on street space interaction function. People exist in local social life practices, and their daily settlement behavior constantly repeats their experience of place and strengthens their interaction with it, making it a key element in the construction of selfidentity and reflecting the strong connection between people and place. As a result, history is not only fixed in the buildings of the historic district, but also penetrates into the lives, work, and social networks of the residents. The conservation of historic districts should also focus on promoting community management, activities, and cultural promotion. The core concept of conservation also lies in promoting sustainable social development through

economic and cultural recovery and other diversified means. Therefore, it is important to pay attention to the participation of residents in the conservation of historic districts and inform them in time to enhance their sense of participation. The street space in the historic district is mainly a space where people's behavioral activities are frequent and communication is high, so it is possible to set up benches, landscape vignettes, and other resting service facilities according to the current situation to increase the time of people staying in the space and play the interaction function of the street space. By continuing the existing social networks and daily life experiences, the conservation of the Sishengci historic district integrates the residents into the social space of the district and preserves the spatial connections between the residents and the original social attributes of the Sishengci historic district. By creating multi-level tourism routes, visitors can learn about the actual residents' living conditions and have a richer viewing experience while traveling. As a common memory of urban residents' life, the historic district space is a valuable resource for future development and can inject new vitality into the city [35,36].

(3) Extraction of the cultural genes of the historic district. The public space of the historic district has the functions of worship, assembly, life, and transportation, closely related to the life of residents and the activities of visitors, and is a valuable material cultural heritage of the historic district, as well as a carrier of immaterial culture. As imagery of material culture and living environment, the Sishengci historic district can be regarded as a container of time. Once the past time is attached to the long-established heritage, it is bound to penetrate into countless fragmented individual experiences and is constantly reshaped by recollection or forgetfulness, taking on a variety of complex forms, not so much as real history, but as constructed memory [37]. Therefore, in the conservation process, in addition to adhering to the basis of authenticity and cultural living preservation, we must also fully understand the spatial characteristics of the heritage resources in the historic district, refine the cultural genes of the ancient town, and excavate the deep cultural structure. By making architectural places and cultural symbols of historical relics into cultural carriers, shaping local characteristics and creating memories of places, triggering pride and identity of residents in their way of life, and promoting positive human experiences in historic districts, they become a set of readable symbols and messages that become an environment that expresses itself [38]. The future can be based on this to attract socio-economic investment and implement industrial operations through cultural heritage and innovation.
