Introduction to the old street: The biggest feature of the ancient folk houses in Yuncao is that they combine residences and shops. Both sides of the old street are lined with blue brick horse-head walls. Two-story buildings with two bays and three bays are lined up in rows, with shops in front and behind. Square or front shop and back hall. Most of the upper floors are bedrooms. The carved wooden window pavilions are both ventilated and bright. The front canons of the building are projected out to provide shade from the sun and rain. Each two entrances are connected by a patio, which Huizhou people call "Four Waters Returning to the Hall", which means that the rain and dew from all directions can be collected and prevented from flowing out, which can lead to money and business prosperity.