In order to understand the dynamic properties of transmission tower-line coupling system and the non-linear wave-induced response of iced conductor cross-section , a three-tower and two-line finite element analysis model was built, in which the Davenport spectrum was chosen as target spectrum to simulate stochastic fluctuating wing wind, then the wind was created by adding harmonic wave and stochastic wind above. By using the existing crescent icing calculation model, single tower, tower-line without icing and icing tower-line with different attack angle were investigated based on time-history analysis method, the displacement of tower and line, and the stress of steel were analyzed simultaneously. The results indicate that icing has some effect on the displacement and stress of the transmission tower-line system, and the nonlinear-galloping of transmission tower-line coupling system is important.