It refers to a structure in which two towers are used as supporting points and three cables are used to fix it in the construction of a long-span bridge. This structural design is often used for long-span bridges.

The technology of twin towers and three cable planes is often used in bridge design, such as buildings and large stadiums. By using the double towers and three cable planes structure, the weight of the building can be effectively shared, and the stability and seismic performance of the structure can be improved.