Take the wooden structure as the skeleton, meet the actual functional requirements, and create beautiful architectural forms and corresponding architectural styles. Wood structure system has many advantages: for example, the maintenance structure is separated from the supporting structure, and the seismic performance is high; Convenient materials and fast construction speed. At the same time, wood structure also has many shortcomings: it is easy to be corroded by fire, termites and rain, and its duration is shorter than that of masonry buildings; Due to the increase of engineering quantity, the demand for finished wood is in short supply; It is difficult for beam-frame system to realize complex architectural space. But there are also a few masonry buildings in the ancient buildings in China. For example, "Historical Records" said: "Stone chambers and golden chambers belong to the state." ; For example, there are many records in the Notes on Water Classics, and in Wei Shui Pian: "There are stone chambers beside the stream to build the residence of Taigong". Masonry structures are mostly used in tower buildings.

2. The principle of maintaining the framework system.

China's wood structure system has always adopted the structural principle of frame system: adding four columns, beams and vertical purlins to form a "room", and the general building consists of an odd number of rooms, such as 3, 5, 7 and 9 rooms. The more bays there are, the higher the water level is. The Hall of Supreme Harmony in the Forbidden City has a 1 1 bay, which is the highest existing ancient wooden structure. The facade is divided into three parts: abutment, roof and roof. Among them, the roof of the official building is the most important part of architectural modeling, with huge scale and far-reaching influence. Columns and vertical and horizontal beams are combined into various forms of beam frames, so that the load on the upper part of the building is transferred to the foundation through the beam frames and columns, and the wall only plays the role of enclosure and separation, and does not bear the load.