Introduction to the wall collection of the Bojiajiao Palace: There are 38 double-pavilion-style wooden wall chambers arranged around the Bojiajiao Palace. There are 3 Tiangong Pavilions at the back window. The two sides are connected by arch bridges. The shape is very exquisite. The wall collection is divided into two floors. The upper floor is a Buddhist niche with hook rails and a roof outside the niche; the lower floor is a sutra cabinet, which contains more than 1,700 volumes of Ming and Qing scriptures, totaling more than 18,000 volumes. The whole building is integrated and is the only well-preserved and large-scale Liao Dynasty wall collection in my country. It was hailed as "the only one in China" by the architect Liang Sicheng.