In geomantic omen, it is considered that geographical environment and architectural design have an important influence on people's life, health and wealth. Among them, "dragon" is often regarded as a symbol of auspiciousness, and its "mouth" represents concepts such as airport and exit. If a building or place can be regarded as a "living longkou", it means that it has an excellent geographical location and architectural design, can absorb and gather a good atmosphere, make people feel comfortable and happy, and thus bring good luck and development opportunities.
"Huolongkou" usually has the characteristics of open terrain, pleasant surrounding environment and spacious front.