Project Introduction: The main line of the Xi'an-Chongqing High-Speed Railway has a construction length of 538.261 kilometers, including related supporting projects for introducing the Chongqing hub and Dazhou hub. It includes 79.441 kilometers in Shaanxi Province, 286.425 kilometers in Sichuan Province, and 172.395 kilometers in Chongqing. There are 269 bridges with a total length of 125.7 kilometers and 92 tunnels with a total length of 355 kilometers along the main line, with a total bridge and tunnel length of 480.7 kilometers and a bridge-tunnel ratio of 89%.