Abstract:With the increasing scale of highway construction in China, large-span and steel structure bridges are widely used. In the exploration and continuous innovation, the bridge theories and construction technologies, and new technologies and new methods are constantly popularized and used. Long-span bridges are widely used in modern bridges because of large stiffness based on steel structure. With the development of bridge technologies, the bridge detection technologies also need to be continuously innovated according to the bridge characteristics. The qualities of detection and evaluation technologies are directly related to the service life and safety of the bridges. The daily common steel structures are analyzed. Taking an actual detection as an example, the basic method of detection and evaluation is explained by analyzing the disease detection of conventional steel structure bridges in practical application. The bridge is evaluated according to the corresponding detection results.