Abstract: A new anti-galloping device is presented, and a single-degree-freedom dynamic model is employed to investigate the anti-galloping mechanism of this device. A typical finite element model of transmission lines including iced conductor and the anti-galloping devices is set up by the computational mechanics method. The galloping in the case without an anti-galloping device and the galloping inhibition as the anti-galloping devices are mounted on the typical line are numerically simulated based on the aerodynamic coefficients of the iced quad-bundled conductor varying with attack angles determined by wind tunnel tests. Furthermore, the parameter optimization of the anti-galloping device is numerically carried out. The numerical results show that the effect of the new anti-galloping device is evident and the device is prospective in engineering applications.