During the construction of power grids, traversing areas with heavy icing is often unavoidable. Surveys in high-altitude regions have identified two primary forms of inhomogeneous covering ice: large spans and significant height differentials. However, the characteristic behaviour of transmission conductors during ice shedding jumps under inhomogeneous covering ice conditions has not been fully investigated. To address this gap, this paper first establishes a nonlinear finite element model for jumping due to the ice falling off from the lines in transmission lines and introduces inhomogeneous covering ice impact factors to quantitatively describe the inhomogeneous covering ice in the model. The accuracy of the simulation model is validated through real experiments and literature data. Using a 1000 kV ultra-high voltage AC transmission line as a case study, the impact of different icing patterns on multi-span lines is investigated. The research findings indicate that various forms of icing significantly dynamic feature effects of conductors after ice-shedding. These results provide valuable references for the design of transmission lines and the development of ice-shedding strategies.