At present, the special investigation of cultural relics in Sichuan Province's corridor bridges has been fully completed, and the resource base and preservation status of corridor bridge cultural relics in the province have been systematically sorted out. According to the Fourth National Cultural Relics Census, there are a total of 94 existing corridor bridge cultural relics in Sichuan Province recognized as immovable cultural relics; According to the three-year action plan for the protection of bridges (2023-2025), a total of 87 cultural relics of bridges have been included in the scope of action, including 14 national and provincial cultural relics protection units, and 8 bridges with protection value have been newly discovered. This survey is an important component of the three-year action plan for the protection of bridges in Sichuan Province. To ensure the comprehensive and accurate results of the investigation, the Sichuan Provincial Cultural Relics Bureau coordinated the efforts of the Provincial Institute of Cultural Relics and Archaeology, and formed a multidisciplinary expert team in conjunction with city and county census agencies. The team systematically promoted the investigation through a combination of data verification, field surveys, and questionnaire interviews. During the field survey phase, not only was the architectural form and preservation status of the corridor bridge recorded in detail, but accurate data was also retained through techniques such as 3D scanning and on-site surveying. The investigation not only focuses on the material form of the covered bridge, but also delves deeper into its living cultural connotations. The investigators developed a specialized interview form, visited local villagers, and systematically recorded the historical use, functional changes, and bridge customs of the covered bridge. They collected a large amount of precious oral historical materials, providing fresh support for the study of the cultural connotation of the covered bridge. Sichuan Langqiao spans across 18 cities and prefectures in the province, starting from Wanyuan in Dazhou in the east, reaching Hanyuan in Ya'an in the west, Huili in Liangshan in the south, and Ruoergai in Aba in the north. They are mainly densely distributed in the Sichuan Basin and hilly areas, extending along the Jialing River, Minjiang River, Fujiang River, Tuojiang River and other river basins. There are many of them in Chengdu, Mianyang, Nanchong and other places, which are closely related to the complex water system and traditional transportation network of Sichuan. In terms of architectural techniques, these covered bridges demonstrate the wisdom of adapting to local conditions, covering various structural types such as wooden beams, stone arches, braces, and outriggers, such as sister bridges with twin bridges and grand five-star bridges. Among the 87 Sichuan covered bridges within the three-year action scope, 5 are national key cultural relics protection units and 9 are provincial-level cultural relics protection units. These 14 covered bridges are distributed in the Sichuan Basin and its surrounding mountainous areas, spanning from the Ming and Qing dynasties to the Republic of China period, with diverse types and functions. For example, the Red Army Bridge (Qinglinkou Ancient Architecture Complex in Jiangyou City, Xinmin Village in Pingwu County), Baishanliang Bridge, and Goujun Bridge still retain slogans and memories from the Long March period, becoming important cultural relics of the Red Army. (New Society)