Abstract: The wind-induced vibration mitigation of transmission tower-line system using friction dampers is investigated in this paper. A configuration of semi-active friction damper for transmission tower is presented and the multi-degree-of-freedom model of transmission line is established firstly. Thereby, this paper develops the dynamic analysis model and analytical method of transmission tower-line system incorporated with friction dampers. Then, two control strategies are proposed for the wind-induced response mitigation based on damper properties, and the control performance is examined numerically. It is found that the semi-active friction dampers are suitable for the wind-induced vibration control of transmission tower-line system due to its simple configuration as well as higher energy-dissipating capacity.