Abstract:Taizhou Ancient City is located in Chengguan Town, Linhai County, Zhejiang Province, located on the southeast coast, and has been an important town in eastern Zhejiang since ancient times. The ancient city of Taizhou has both defensive and flood control functions. In terms of defense, in addition to the city wall, the function of the urban layout is also used to strengthen the weak links in the defense, and at the same time, the coastal guard station echoes with Taicheng to form a strong coastal defense system. The main measures in flood control are: the construction of strong flood-proof and anti-flood walls. Establish a system of drainage canals in the city. The excavation of the East Lake is not only conducive to military defense, but also conducive to the regulation of floodwaters.