1. Yingmen City Wall is one of the landmark buildings of China classical architecture. There are different opinions about the function of yingmenqiang. To put it bluntly, the inner courtyard will not be unobstructed by outsiders, which is also in line with China's ancient concept of hazy beauty. In addition, in Feng Shui, the door is the entrance of "Qi" and the foundation of wealth and prosperity. Being strong at the door can gather this kind of "qi" and restrain it. 2. With the development of the society, the effect of feng shui on the entrance wall is more and more prominent in the door-to-door feng shui, and the design of the entrance wall is also diversified. Moreover, many families' houses have no courtyards and are residential buildings. If the entrance door faces the corridor, they will decorate the background wall and finally hang pictures, which is actually the evolution of the welcoming wall in the residential buildings. Besides being a necessary feature in the building, the entrance wall is to prevent the family from being snooped. The reason of geomantic omen is that the orientation of the house in the portal geomantic omen is not good, which conflicts with the owner's animal sign and numerology attribute. Therefore, we will use the entrance wall to change this feng shui, to avoid the cause being washed away by the dirty air outside, to frustrate ourselves in our career, or to get what we want through our own efforts.