At present, there are many kinds of trusses used in the exhibition, which are mainly divided into the following categories:

1, steel truss: steel truss can be divided into three-four-pipe flange type and three-four-pipe screw-in type according to the connection mode, and their maximum service span is generally about 6 meters. Steel trusses are relatively cheap and suitable for enterprises with small investment.

2. Aluminum trusses: including three-tube or four-tube welded aluminum trusses and three-tube or four-tube riveted aluminum trusses, open trusses, plug-in trusses, toothed trusses, etc.

The maximum span of riveted aluminum truss, open truss and inserted truss is also about 6 meters, and the maximum span of toothed truss is generally controlled at about 4 meters. This paper focuses on aluminum welded trusses. Because of its light weight, its maximum span can reach 12 m-15 m, which is especially suitable for the light frames of some large exhibition stands (such as the top light frames of auto shows). If the overhead light frame is made, it can be supported by columns or hung in the air.

3. Grid structure: including LH aluminum grid structure and cue grid structure, which are the two most commonly used grid structures in the exhibition. These two structures can be used as the platform part, the wall part and the ceiling part, which have strong combination and interchangeability, can be applied to booths of different sizes and areas, and are also familiar product structures for many exhibitors and designers.