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The transmission tower-line system, as an important component of lifeline engineering, suffer serious damage in snow and ice related hazards.Extensive icing disaster investigation shows that tower failure is the most serious accident.Once tower failure occurred, reconstruction is a common practice.However, the normal operation of power system was affected by reconstruction seriously.Global warming render some more likely to suffer snow and ice related hazards, it is advisable to take precautionary strengthening measures to promote the collapse resistant capacity of existing transmission tower.In this paper, research object was based on a damaged circuit subjected to snow and ice related hazards in Hunan province, and the FEA model of the transmission tower-line coupling system retrofitted by parallel component method was established using the ANSYS software, considering strength failure and yield failure.The exact retrofitting position was detected by increasing monotonically ice loading, and nonlinear buckling analysis was carried out to check the stability.The wind-induced vibration analysis results verified that the ultimate bearing capacity and stability of retrofitted tower-line system was improved greatly.