In the Liwan Binhai Resort, I went to the ancient city of Pinghai in Huidong County the next morning. Pinghai Ancient City is a scenic spot in Donghai Village, Pinghai Town, Huidong County, Huizhou City, Guangdong Province, built in Minghongwu 18 years (1385 AD). The ancient city of Pinghai was built in the Ming Dynasty's East Gate, West Gate, South Gate and North Gate Towers, and was rebuilt in the Kangxi period of the Qing Dynasty in 1721 and after the founding of New China. Four doors with masonry to form arch coupon gate, the door is the top of the mountain gate building, ridge, ridge, railings and other places, with gray plastic, brick carving, murals, ceramic inlay and other craft decoration, gray tile roof, green glazed tile cutting edge, the inside of the door building on both sides of the stone step level, simple and stable shape. Pinghai Ancient City has a history of more than 600 years and is known as a "living fossil" of Lingnan culture. Pinghai is 53 kilometers away from Huidong County, located at the southernmost end of Huidong County, facing the South China Sea, east by the Red Bay, west by Daya Bay, has always been the throat of the sea defense town and the sea import and export of southern Huizhou. At the end of the Yuan Dynasty and the beginning of the Ming Dynasty, the people did not talk about life. During the Hongwu years, Ming Taizu sent Huadu to Pinghai to build a city pool to resist foreign invasion. "The city is 120 feet, 1 foot high, 8 feet high, 871 feet high, four gates." After the establishment of Pinghai City, Pinghai Construction Department was established, Pinghai Camp General Department, Pinghai Camp Zhongjun Reserve Department, and Pinghai Cang also has Pinghai Cang, which is directly subordinate to Shanxian Tunliang Agency. During the period of Qing Kangxi to Jiaqing, there were Daxingshan Forts at the forefront of Pinghai City, and the Forts along the harbor, the Forts of Duntou Port, Dongguantou Fort and Jitou Fort, and the Forts of Jitou were built into a high-barrier sea defense line. The unique origin and geographical environment of the ancient city have created a unique language military voice. It is a combination of Guangzhou dialect, Chaozhou dialect and Hakka dialect based on the northern voice. It can be used freely and answered in a variety of dialects. Therefore, the eastern Guangdong area spreads the saying "know Pinghai dialect, travel all over the world".