in the way of feng shui in tombs, the dragon is the first thing, and the dragon is the spirit of the earth, and the water boundary gathers, but the wind disperses. However, the use of water has both good luck and bad luck, which is really a taboo for the yin house. Therefore, although the cave of Longzhen is surrounded by sand and water, once the wind blows, even if it is used as a cemetery, it will inevitably run down in the future. The so-called "dragon-true cave" means that the dragon should be true, that is to say, to see if Long Mai in the terrain has the kind of weather that leaps into the ground, twists and turns, crosses the gorge and pays bills, and is alive and constantly, and the gas must be penetrated and cannot be broken until it reaches the cave. The cave is important, that is to say, the selected cave site must have a pointed and square cave star at the end of Long Mai as the symbol of starting the cave. There are dragon sand and tiger sand surrounded by mountains and rivers, and the blessings of such a cave site will continue like a curved dragon body. This kind of land is the land of great wealth and great wealth. As a proverb says, "As you sow, you reap".