Introduction to the ancient town: At a glance, there is a channel on the side of each street wall lane. The clear water in the canal flows gurgling in the village, like jade belts passing through the village road wall lanes. Slates and stone strips are also laid on the canals at the door of every house to lead to the road. More than 300 slate stone bridges form a unique landscape of "small bridges flowing over water" and "winding corridors and quiet paths".