In geomantic omen, the name of dragon is used to represent the trend, ups and downs, turning points and changes of mountains. Because dragons are good at changing, they can be big and small, they can bend and stretch, they can hide and show, they can fly and dive. The mountains are changeable like dragons, so they are called dragons. There is also Long Mai in the flat land, which is marked by micro-topography and water flow. The view on the quality of Long Mai is to examine the long-term of the mountain and distinguish the ups and downs of the mountain. If the mountain is far away, it will be rich, and if the mountain is short, it will be rich. In a word, Feng Shui Long Mai roughly reflects the trend of mountains in China, which is the simple understanding of China geography by ancient sages and the accumulation of thousands of years' experience.