Abstract: The vibration of overhead lines caused by ice-shedding in ice regions may damage metal members and wires stocks, even result in tower collapsed and other machinery accidents. A refined ice-shedding vibration model of transmission tower-line system is established by finite element method considering geometric nonlinearity. Taking the 800 kV transmission line UHV DC from Xiangjiaba to Shanghai as an example, the ice-shedding vibration is analyzed, obtaining the high-jump, the biggest horizontal tension forces, the swing shift of insulator and the restraint forces. The results show that ice-shedding of electrical wire will cause great vertical vibration. The maximum wire tension increases by nearly 20%, and the bearing reaction of power transmission tower increases by about 30%. Using the proposed model, a total of 12 ice-shedding scenarios are studied with variables including ice thickness, insulator swing stiffness, span length, damp ratio, unequal spans, number of spans, wind loads. The influences of those parameters on vibration ice-shedding were analyzed.