In order to determine the vortex-induced vibration of the flexible hangers equipped with lighting fix? tures of an existing arch bridge，numerical simulations and wind tunnel tests were carried out. Aiming at the lighting schemes for the existing hanger and the additional hanger，the flow characteristics around typical cross-sections with different yaw angles were simulated. The variations laws of the aerodynamic coefficients and the vortex-shedding be? havior with the yaw angle are discussed. Then，the vortex-induced vibrations of hangers with different yaw angles were determined by segment wind tunnel tests. The experimental phenomena are discussed together with the results of the numerical simulations. The results show that the installation of lighting fixtures significantly changes the vortex-induced vibration performance of existing hangers. When the incoming flow is perpendicular to the bridge axis，the vortices shed from two typical cross-sections along the cable axis are different in frequency and intensity， which decreases the possibility of the vortex- induced vibration of hangers. When the yaw angle of the incoming flow is around 30°，the vortex-shedding characteristics of the two typical sections tend to be consistent，which enhances the possibility of the vortex- induced vibration of hangers. The additional hangers，which are enclosed in rectangular lighting fixtures，show more flexible characteristics and are more likely to suffer from vortex-induced vibration，so additional countermeasures need to be considered.