Suspension bridge, also known as suspension bridge, is the longest span bridge, and Luding Bridge on Dadu River is the suspension bridge. Suspension bridge is mainly composed of cable, pylon and anchorage. Two steel cables are suspended between two towers, and the bridge deck is lifted by steel cables. The cables are fixed on the anchorage on both sides of the bridge tower, and the anchorage bears the weight of the whole bridge. In recent 20 years, the construction of suspension bridges in the world has reached its peak. At present, there are nearly 20 suspension bridges with spans exceeding 1000 meters. The Akashi Strait Bridge, the largest suspension bridge in the world, was built in Japan in 1998, with a main span of 1990 meters.

Cable-stayed bridge, as a cable system, has greater spanning capacity than beam bridge and is the most important bridge type in long-span bridges. Cable-stayed bridge is a deck suspended by many steel cables directly connected with towers. Cable-stayed bridge consists of pylon, main girder and stay cables. The types of cable towers are A-type, inverted Y-type, H-type and single-column type, and the materials are steel and concrete. Stay cables are arranged with single cable plane, parallel double cable plane and stay cable plane. The first modern cable-stayed bridge was built in Sweden in 1955, with a span of182m. At present, the largest span cable-stayed bridge built in the world is Normandy Bridge in France, with a main span of 856 meters. Shanghai Yangpu Bridge completed by 1993 is the largest cable-stayed bridge in China at present, with a main span of 602 meters.