Courtyard is the basic unit and key link of garden construction. The main elements of a closed courtyard are: walls, buildings, closed corridors, etc. Through mutual echo, mutual penetration and mutual penetration among these elements, a complex and changeable courtyard space is created. With rocks, trees and flowers, it is a wonderful scenery of Xanadu. The typical closed courtyard space, such as the return of my book to the garden, is located to the north of the Yi Feng Xuan, and is a closed and quiet study. On the west is a two-story hard mountain building, with a three-door corridor in the north and south and east, forming a small courtyard.