To investigate the windresistant behavior of longspan steel truss bridge during construction of flexible arches, taking the world’s longest steel truss bridge with flexible arches as an example, the influence of closure position on the windresistant behavior has been studied, and based on the analysis results, different windresistant measures are proposed and compared, and an innovative measure is proposed according to the mechanical characteristics of this bridge. The results show that the protection against wind damage should be placed in a prominent position especially during the erection of the flexible arches. The innovative measure is effective, and provides reference to similar projects.