Miao Xiyong said in "A General Theory of the Buried Sutra Wing and the Inverted Staff": "The person who inverts the staff is also an important method for the burial family to set a hole to put the coffin." Putting the coffin down with a stick is the last key link in Feng Shui. Even if the shape is good and the burial method is wrong, the previous efforts will be in vain. Guo Pu's "Buried Sutra" said that "burying a corpse in a cave is as fierce as burying a corpse", which is what it means. It is necessary to set a hole to put the coffin, avoid hurting the pulse, keep the pulse, do not distinguish between wet and dry, and do not violate the shallow depth, otherwise it will not only be unlucky, but also fierce.