The ancient city wall in Linhai, Zhejiang Province has a long history. Since the inception of the Jin Dynasty, it has been more than 1600 years. The main part of the ancient city wall has been preserved until today. The ancient city wall has been built along the river, and the mountain is in a twist and twist, and the majestic is spectacular. Especially the section of Beigu Mountain, built on the top of the cliff, flying and hovering, enemy Taiwan, Qilianyun, city tower high stand, compared with Beijing Badaling, can be called double absolute, called "Jiangnan Badaling", but not reputation. More unique is that on both sides of the ancient city wall of Linhai, ancient trees are towering, green all year round, and the city wall is hidden in the green bush, which adds a touch of spirit. In addition to the function of the enemy, there is also a very important role, which is the function of flood control. One-third of the length of the city wall is built along the Lingjiang River. Taizhou Fucheng is located near the Lingjiang River. The river water meets the tide, and the water level rises. The city wall is like a big embankment, which has been fighting against the impact of floods for more than 1,000 years. For this reason, Linhai City Wall in the construction design, took special measures to repair the city as an arc, especially the "horse face" facing the water to repair the semi-circular arc (the other side is still square), in the ancient city wall in the country, very rare, known is still an isolated case. Due to the flood resistance of the city wall, when the Yuan Dynasty destroyed the Southern Song Dynasty, the Yuan Emperor ordered the demolition of all the ancient city walls in the south of the Yangtze River to facilitate the long drive in, and the seaside city wall was specially exempted from demolition because of its irreplaceable flood control function.