The two "grammar books" in the history of Chinese architecture are extremely important for the study of the technology of Chinese architecture. They are the workings of Song Dynasty and Qing Dynasty. In Song dynasty, the ratio between the various parts of the specifications of a house and its relationship, on the basis of their level of wood material. TS’AI is divided into eight specifications. In Qing dynasty, about TS’AI, CHIH and FEN in the concept of craftsman who seems to have no memory of the mind, and as part of bear Gong - TOU-KUNG, become a metrics. TOU-KUNG are made up of TOU and KUNG. In the Song Dynasty, it was called “You”, while in the Qing Dynasty, it was called “Zan”. There is another important difference in TOU-KUNG between Song and Qing dynasties. The Tou set along the column center line parallel to the front of the building is called sumach Tou. It is interactively placed in sumach Tou, on which brackets are supported with several layers.