It is a well-preserved anti-Japanese defense system in Ming Dynasty. Pucheng was originally located in the corner of Puwan Bay, and gradually became a beach of calamus and reeds due to tidal fluctuations and sediment deposition. Legend has it that more than 1500 years ago, the ancestors who came here to reclaim wasteland got the name "Pumen" by weaving Puye as a door. In order to resist the invasion of Japanese aggressors, in the 17th year of Hongwu in Ming Dynasty (1384), Xia Ji, the first general household stationed at the foot of Longshan, presided over the construction of the Pucheng Wall, which was renamed "Pucheng" three years later. Orthodox eight years (1443), after the merger of Wucheng "Zhuangshi Suo" into the city, collectively known as "Puzhuang Suo Cheng" today, the Ou language here can still communicate with the Ou language in Cangnan, Pingyang and other places, but has a strong Minnan accent. For more than 600 years, this language island has not been assimilated by the surrounding Minnan dialect, which is also a miracle.