When you open a door, open a shop, release water, buy things or set things, you must follow the five elements of water. Opening the door and releasing water is very common in the yellow calendar, which is a professional term in geomantic omen to avoid misfortune. The first way to open the door is to use the fixed method of traveling in a year, and choose three auspicious prescriptions, longevity, longevity and natural medicine. The second is to promote the prosperity of Yuan rhyme and the decline and prosperity of fleeting time. The method of discharging water is to concentrate the courtyard water in a good direction, and generally arrange to flow to the twenty-four mountains and dry days.