What are the two main types of wooden structure systems in China?

China's wooden structure system is composed of columns, beams, purlins, purlins, bucket arches and other large wooden components to bear the loads from roofs and floors, as well as wind and earthquake forces. At the latest in the Han Dynasty in the 2nd century BC, two main wood structure systems were formed, namely, beam-lifting type and bucket-piercing type. The key technology of this wood structure system is tenon-mortise structure, that is, the connection between wooden components does not need auxiliary connecting components made of other materials, but mainly depends on the insertion between two wooden components. Traditional architecture in China is a building system based on wood frame, with soil, wood, brick, tile and stone as the main building materials. The professional division of labor in construction mainly includes: carpenter, Joinery Work, bricklayer, bricklayer, stonemason, geotechnical engineer, oil painter, building material worker, paperhanger, etc. Among them, Big Wood is the first work, which plays a leading role in the construction.