This is the image of seven nights fighting, cows, women, empty, dangerous, houses and walls in the north. The North Lunar Moon God is a combination of tortoise and snake. Located in the north, the name is Xuan, and it is named after scale. Feng shui refers to the mountains behind the cave. "The Sutra of Burial" says: "The husband is buried with the grave ... followed by Xuanwu." Also refers to the hill behind the villa. "Ten Books of Yangzhai": "Every house has a hill behind it, which is called Xuanwu." Feng Shui experts believe that Xuanwu Mountain should bow down and worship, and the mountain gradually hangs down to the cave to meet the burial cave. Guo Pu's "Buried Sutra" cloud; Xuanwu hangs its head. Note: "When you hang your head, you will gradually descend, and if you are buried by others, you won't be watered at the point where you receive it, you can sit safely, and then you will hang your head." When the water falls, it is annoying and untenable, which is the land of diarrhea. "The essence of the essence" said: "People sleep on the mountain, people live, and water is injected into the heart of the church. It also means it. " In fact, the requirements for Xuanwu, like the black dragon, white tiger and suzaku, should bow down and embrace all beings. Liao Xiyong's "Burying Wings and Shasi Silks" says: "When a real dragon came to live, it felt like a hole, and its face was low, so Xuanwu bowed its head." Hold your head high, you will be ruthless and fierce. If there is no Xuanwu Mountain, the wind blows before and after, and the gas does not gather, which is the base address.