There is a halo around the ground in front of the cave, and the misty water bends to meet each other. It's called Tang Xiaoming. Liao Jun's Song of the Tang Dynasty: "Tang Xiaoming stands under the halo and distinguishes between true and false." Feng shui experts believe that there must be a small hall where the real dragon falls into the cave and is furious. Tang Xiaoming's body posture is very complicated. Generally speaking, there are two kinds of sand beside the cave in Long Mai, which form a zigzag pattern with the middle stream. When the front water of the dragons and tigers on both sides of the strait divides and merges first, the middle stream is slightly convex, with hidden sand and hidden arches beside it, like soft wings under the cicada shell. This is cicada wing sand, and the two sides of the water meet at the communication place of cicada wing, which is called the big eight characters. If the midrib is slightly hard, such as a round hat, it is called the bulbous eaves. There is a flat nest under the cornice called the burial opening, and there is a small hall under the burial opening. There are two sand looming on both sides, which are shaped like ancient skirts, called the joint and the cornice. At the same time, at the end of the lapel, there are two water lines, which are called shrimp whiskers. At this time, cicadas are sandwiched between them, shrimps are intertwined, and water is divided into three parts, which is the true shape of Tang Xiaoming. Miao Xiyong's "Buried Sutra Wing" says: "There are four bodies in the cave: nest, pliers, breast and bulge, so naturally there are three methods of drowning: crab limit, goldfish and shrimp beard, which are designed to lie on one side across the eaves of the ball and at the turn of the micro-boundary, named Tang Xiaoming. There must be fresh wing sand on both sides, which seems to be nothing, wrapped outside. "