Refers to the boundary vein around the point heart Tang Xiaoming, which is divided into upper and lower waters. Xu Shanji, "what should the son of man know? Water method: "those who close the chest with water, the boundary pulse before the point, divided into upper water and lower water." "If the breast meets the skirt, it is named." Feng Shui experts believe that the heart nest hall is the place where all waters meet, so the water from the veins should be separated, collected and circled around the heart nest hall, so there is a saying that there are three parts of wind and water. In fact, the more layers on and off, the better. Be like; Dragon and tiger are born from the star peak, and the water bypasses the dragon and tiger at the star peak. Before the dragon and tiger, there is a fork water. The midvein moves forward and bulges near the acupoint, with cicada wings beside it. Water around cicada wings, close to the front of the wings, for the big eight-character water. When the midrib winds in front, it grows a hard bulbous eaves, and the water bypasses the left and right from the bulbous eaves and closes in front to form a small splayed water. Under the eaves of the carpet, there is a famous tanwo mound, and under the mound, there is a small famous hall. The left and right hidden sand burial openings coincide with the ball beard in front of Xiaomingtang, and the water around the ball beard is called shrimp beard water. The place that goes down to the acupoint is also very weak, invisible, and it is also bypassed and separated. If the cave field is wrapped in layers, it is water that closes the front line. Personal water is an important symptom of Long Mai's knot. Liu Ji's Remnant Man Xing said, "Why not? I don't know the three-point profit, which is economical and difficult to block. The evidence of the dragon is also true. The evidence of the point is also true for the ball eaves, burials and lapels (referring to the separation of hidden sand). " "Wandering in Kanyu" says: "The place where you meet your feet is true, and the top and bottom are all due to gas condensation. The top of the pillow blanket goes down and the hem is clear. "To understand the on-off and off, it is necessary to ask the above four families for a full certificate in Longdian. If there is no knot, the water will go straight to Tang's acupoints and pour on his head. If the water doesn't agree, the figure of eight will be straight, which is called cutting feet, which is an unlucky sign. There is a cloud in "Prosperity of People": "Cover the water without a blanket for a shower, and there is no proper name for cutting off the feet, or there is no connection between the upper and lower parts, so there is no need to ask for this fake land. "