Refers to the import and export of water within a certain alkaline range-as large as a county town and as small as a village. Miao Xiyong's "Burying Wing Shuikou": "The husband of Shuikou always comes from one side." Generally speaking, the entrance includes inflow entrance and outflow exit, the entrance is also called Tianmen, and the exit is also called Dihu. Feng shui is especially important for families. The range of the nozzle is not limited, depending on the surrounding water flow. Shuikouyun: "One mile to sixty or seventy miles or twenty or thirty miles, the landscape is affectionate. If it arches, it will bear the earth. More than ten miles is also the earth; Those who receive five or six miles or seven or eight miles are in the middle; If you collect one or two miles, you will have one mountain and one water. " Feng shui experts believe that water is the blood of dragons, the external form of anger, and represents the rise and fall of financial resources. Therefore, the opening and closing of the lock of the nozzle is actually the grasp and control of the source of angry money by Feng Shui. The potential of the nozzle should be circuitous and closed. Tianmen is going to open, with a long history and endless life, which shows that it is full of vitality and rich in financial resources. The landlord wants to close it, there is a lot of sand blocking it. It twists and turns like a word and a mysterious word, and it is intercepted layer by layer, gathering gas and making money. No flying, no shooting. Otherwise, you will lose your wealth. The so-called "when it comes, it is passive, and when it goes, it does not flow". Bu Weize's "Snow Heart Fu" says: "When the nozzle is closed, it is easy to achieve without overlapping ... The nozzle loves it as tight as the gourd throat." Miao Xiyong's "Burying Wing Shuikou" says: "Those who are successful in Shuikou ... must close their own doors and carefully wrap them up, or set up a defensive door to wait for their master, or set up a national flag, or go out as a bird, or be a lion elephant, crouching on the water, or meet a mountain of water, wrap them up and turn away from water. This is the best." Shuikouxing bureau is very important for the good or ill luck of people living in the house. Shuikou is related to sales, rich in products and prosperous in population. If the nozzle has nothing to do with it, it will be the culprit. Therefore, there are records of Shuikou construction in local chronicles. If landlords are not tight and there are no peaks, they will build bridges, temple towers and temples to lock them up.