Introduction to Lanxi Bridge: Lanxi Bridge was built in the second year of Wanli in the Ming Dynasty (1574) and rebuilt in the 59th year of Qianlong in the Qing Dynasty (1794). The original site was in the water storage area of ​​the "Lanxi Bridge Reservoir" downstream, and it was moved here in 1984 according to its original appearance. It is a large-span wooden arch bridge with outstretched arms and corridors. It looks like a flying rainbow and cleverly connects the Western Palace to the highway. The bridge has a total length of 48.12 meters, a width of 5 meters, and a height of 9.4 meters from the river bed. The arch has a figure-eight shape and is composed of dozens of thick logs joined vertically and horizontally. It has the functions of resisting compression, bending, and lateral movement. , its bridge structure principle can be regarded as a masterpiece in the history of folk bridge construction in my country.