Zhongyi Bridge is located in the West Lake District, leaving a street, east-west across the Xixi River, built by Sun Hou in the Southern Song Dynasty, that is, the 11th year of Jiading (1218). Because of deep brotherhood, so the name loyalty.

Zhongyi Bridge is a single-hole circular stone arch bridge with a residual length of 16.24 meters, a width of 3.65 meters, a net span of 8.09 meters, and a height of 4.26 meters. Both sides of the bridge are paved with long blue stone into a thirteen-step stamp, the bridge in the middle of the square platform of the plain. Zhongyi Bridge is a fine structure with typical arch shape of Zhejiang Song Dynasty arch bridge, which is a good example of stone arch bridge in Southern Song Dynasty. Zhongyi Bridge is the only Song Dynasty bridge in Hangzhou and one of the earliest existing ancient stone bridges in Hangzhou. It is of great value to study the structural technology of stone arch bridge and the development and evolution of ancient bridges in Hangzhou during the Southern Song Dynasty. In 2019, it was included in the eighth batch of national key cultural relics conservation units.