I have traveled through the four ancient towns in the south of the Yangtze River. My excessive commercial infestation has made me feel uncomfortable about the ancient towns in the south of the Yangtze River. However, when I walked into the former Tonggu Town, which was built in the Song Dynasty and is currently dominated by Ming and Qing architecture, such a modern Jiangnan County has unexpectedly preserved the most original natural and human elements, the ancient villages and localities here. The human lifestyle has a true ancient charm. Entering the gate of the ancient town, the first thing that enters the line of sight is a shallow ditch that comes along the wall of the house. This ditch is built into the "water gossip" according to the principle of gossip. The house is built along the water, and the stream flows through the front of the house. Everyone can wash tea and wash clothes. The buildings here are mainly in the Ming and Qing Dynasties, including ancestral halls, folk houses, ancient wells and old streets. The outer walls are all green slate, the courtyard houses are wooden structures, and the old streets and courtyards are covered with local pebbles. There are many big families, the door is engraved with family training, and the house is equipped with beautiful stone window. Traveler Xu Xiake used this as the opening of the famous travelogue. "The March of the Ugly (the May 5th of the Gregorian calendar), from the Ninghai out of the West Gate, the clouds scattered, Everyone has a happy state." Today, the bricks and tiles here are as calm as the millennium.