Ice shedding problems have severely threatened the safety of overhead transmission lines and caused enormous ruptures or failures of the conductors and their accessories. It is of great importance to study the dynamic properties of the transmission lines under ice shedding loads. To perform such analysis, the dynamic behavior of two typical strain sections for UHVDC transmission lines under different ice shedding conditions were simulated in this paper. Then, the dynamic response of the key tension plate as well as its buckling properties was analyzed based on the extacted ice shedding results. Finally, laboratory tests were conducted at the China Electric Power Research Institute to assess the critical value of the buckling of the tension plate. The results show that the key tension plate studied in this paper is primarily influenced by the loads along the transmission lines after taking its dynamic response and buckling properties under synthetic ice shedding conditions into consideration. The short-term fluctuation of the tension should be the major focus in tension plate designs.