Core Viewpoint - The article highlights the cultural and architectural significance of the Chengyang Yongji Bridge in Sanjiang Dong Autonomous County, Guangxi, showcasing it as a masterpiece of traditional Dong architecture and a representative of intangible cultural heritage in China [3]. Group 1: Architectural Significance - The Chengyang Yongji Bridge, completed in 1924, is constructed entirely without nails or rivets, using wood and stone, measuring nearly 80 meters in length, 4 meters in width, and 12 meters in height [3]. - The bridge exemplifies the craftsmanship of Dong wooden architecture, which was recognized as a national intangible cultural heritage representative project in 2006 [3]. Group 2: Cultural Heritage - The Dong wooden architecture employs traditional mortise and tenon joints, resulting in a structure that is both sturdy and artistically valuable [3]. - There are over 200 Dong wind and rain bridges in Sanjiang, including notable examples like the Sanjiang Yiyang Wind and Rain Bridge and the Chengyang Yongji Bridge [3].