Transmission line systems are vulnerable to winds and storms, particularly in cold climate regions where atmospheric ice accretes on network equipment. This paper describes a method for analyzing wind-induced vibrations of ice coating transmission towers coupled with power lines. An ice coating model of transmission line systems is introduced. Wind loads on ice coating transmission line systems are also presented. The time histories of wind speed acting on transmission line systems are simulated with the harmony superposition method. Finally, the responses of ice coating transmission line systems under different thickness of ice and different wind velocity are discussed. The results show that the displacement and unbalanced tension increase rapidly with the thickness of ice and wind velocity increasing. The value of the unbalanced tension increases significantly when the ice coating on conductors is nonuniform.