Play a role in blocking murderous look. However, due to the different sizes of quadrangles, different owners and different doors, the construction of screen walls also has certain rules. Generally speaking, it is the screen wall, which is built in front of the official or wealthy businessman. The screen wall is divided into three parts, the top is a pipe tile, the middle wall is a rectangular brick frame, the middle and four corners are brick carvings, the words "Fu, Cai and Wang" are engraved in the middle, and a sumeru seat is built below. There is also a screen wall called wild goose wings, which is sewn with fine bricks and carved with flowers and plants at the four corners of the screen wall.
The wild goose wing screen wall of the whole building fully embodies the solemnity and beauty. Generally, the screen wall of wild goose wings is mostly built in yamen, government offices and luxury houses, and there is another screen wall on both sides of the gate, also called the eight-character screen wall. When building this eight-character screen wall, the portal, the legs of the gate and the cornice should form an included angle of about 130 degrees. Symmetrical patterns and large brick carvings are carved on the screen walls on both sides of the gate, which makes a clearing in front of the gate. It turned out that the stones were up and down.
The construction of ancient screen walls in China is strictly graded. For example, as early as the Spring and Autumn Period, the Book of Rites recorded: "The emperor's screen is outside, the vassal's screen is inside, the doctor uses the curtain screen, and the scholar uses the curtain screen", which means that the emperor can build a screen wall outside the door, the vassal can build a screen wall inside the door, the doctor can cover it with a curtain, and the scholar can only cover it with a cloth curtain. So not everyone can build a screen wall, only ordinary people can build it in the Ming and Qing Dynasties. In ancient China, the use of screen wall can be roughly divided into the following grades: first, the gate is in the middle, and the screen wall is placed outside the door, which are the palaces of princes and nobles. The second floor is the center of the gate, and the screen wall is placed inside the gate. The last pass is a typical gate in the southeast, with a built-in screen wall, a typical old Beijing quadrangle.