Abstract: Study on the stability and the mechanical behavior of high voltage（HV） transmission line and tower structure under ice load can help to resist ice disaster. How to improve the stability of the HV power grid and establish an effective simulation method is the concerning focus in this field. In this paper, the finite element method taking tower-line coupling factors into consideration and the analytic method without consideration of tower-line coupling factors were introduced, and one 220 kV transmission line lying in ice area of Jiangxi power grids was chosen as an example to study the different mechanics response under ice load between an established finite element model including three towers and two span lines and the analytic method. Some key parameters such as the force distribution along overhead lines, maximum allowable ice cover, tower stress, and strain were calculated and discussed taking into account the real load characteristics and the tower-line coupling factor. Results show: in the condition of no ice or light ice, the tower-line coupling effect can be ignored without significant deviation, while as the increasing of ice thickness, due to the rising of the coupling effect between tower and line, a significant deviation may be introduced once the coupling was overlooked. Therefore, it is necessary to pay attention to the influence of the tower-line coupling effect on the transmission line performance. The established simulation model in this paper is positive for design, analysis, and running maintenance of the HV transmission line in ice area for considering tower-line coupling effect and load characteristics.