Abstract: An adjunctive ice element methodology and a density changing methodology used to analyze the ice-accreting and ice-shedding on transmission lines are investigated. The applicability analysis of the two methodologies is carried out based on an identical example. The mechanical parameters of ice used in the two methodologies are clarified and the appropriate values of ice parameters are suggested. The results from this study show that it is inappropriate for some researchers to use 10GPa as the elastic modulus of ice when applied to an adjunctive ice element methodology. According to calculating results, the elastic modulus of ice is suggested to less than 107Pa. When the mechanical parameters of ice are appropriately defined, the adjunctive ice element methodology is equivalent to the density changing methodology and both of them can be used to simulate the ice-accreting and ice-shedding on transmission lines.