Traditional arch bridges in China have complex structures and various forms, including steep arches and flat arches, single arches and multiple arches. Arch can be divided into semicircle, ellipse and full circle. Such a bridge is convenient for pedestrians to get on and off and ships to navigate. The longest existing multi-arch ancient bridge in China belongs to baodai bridge, Suzhou, which was built in Yuanhe, Tang Xianzong from 11th to 14th years (8 16-8 19).

An Zi Bridge should be called Anping Bridge, commonly known as Wuli Bridge, with a total length of 2,255 meters. 36 1 Wharf, which spans the bay between Anhai Town in Jinjiang City and Shuitou Town in Nan 'an City, is the hub of land and water transportation between Jinjiang and Nan 'an, and is an important part of Anhai Port, the main port of Quanzhou overseas transportation in Song and Yuan Dynasties. It is the longest existing stone bridge in ancient China. It was built in Shaoxing in the Southern Song Dynasty in the eighth year (1 138) and in the fourteenth year. It was rebuilt many times in Ming and Qing dynasties.

Baodai bridge: the longest multi-arch bridge in ancient times.

Anping Bridge: The longest stone bridge in ancient times.

The two structures are different and cannot be compared.