Abstract：
The main cable is the most important structure of suspension bridge and unchangeable. The main cable is exposed in atmosphere and weathered by all kinds of corrosion medium，leading to rust．First the mechanisms and types of main cable corrosion is analyzed in this paper. Then the influence factors of main cable corrosion are discussed. The conventional protection technology for the main cables of suspension bridge has a certain effect, but there are also some drawbacks. Improving it, application of new material and new technology for the main cable will protect effectively the main cable of suspension bridge. It can ensure the safety of suspension bridge, and prolong its service life.
