The so-called high wall deep courtyard, that is, N heavy door. It can be imagined how the foot-binding women of the old times, with the help of servants, had difficulty in crossing the barriers and seeing the day. The threshold of each door is not high from the outside, but the indoor floor seems to be lower than the outdoor floor, which is especially obvious in the living bedroom, so it is difficult for women to cross from the room to the outside. Kangmen's house is as deep as the sea, and henceforth little feet hinder the boudoir. Regardless of the restrictions of etiquette and religion, such a courtyard design pattern is probably closely related to geography and climate. The fortress house is not easy to be attacked by the north wind in winter, and it is warm in winter because it is built entirely by loess kilns. Man, this clever mammal, under the long enlightenment of nature, tends to benefit and avoid harm; this tendency also coincides with the restriction of the current famous doctrine on human beings. There are seven or eight courtyards in the main residence area, most of which have narrow doors and roofs so small that only one person can pass through them; when entering the courtyard, only the current compartment or main room can be seen, and more rooms can be hidden behind the corner of a certain bend; of course, the bend can only be used by one person; when visitors turn around, they have already entered another courtyard unconsciously, and can not help asking - "how deep the courtyard is deep? Xu,... Years of baptism, rolling years, houses like, stone steps are still, today's frequent visits reflect the past brilliance, moss green, white and green, tile clouds floating, come and fly, unfortunately, no matter how many people visit, it is still stuck in the atmosphere, otherwise in the humanistic visit of the ancient commercialization of modern, why the Northern Song imperial mausoleum? A lonely and desolate school, Du Fu's former residence has lost the humanistic style.