Introduction to residential buildings: Most of the residential buildings in the ancient city are courtyard-style, maintaining the characteristics of the Dali Bai people's "three squares and one screen wall" and "four in five patios" civil structure. The two streets outside the north gate are the main ones. In the residential area, there are pavements and gates facing the street, with a width of generally 6-7 meters, and residential buildings behind. Most of the houses face north and south, and the house orientation is about 15 degrees from south to west, which is the best way of lighting in the local area to make up for the poor lighting of the "four-in-five patio".