In order to solve the problem of whether the maximum compression displacement and fatigue life of the bellows in a GIS bus can simultaneously meet the engineering index

the engineering calculation and finite element analysis are used for calculation. Then

the comparison is made by two kinds of calculation results and experimental verification so to obtain which kind of method is more accurate and reliable. To this end

a detailed process of engineering calculations and finite element modeling is presented. The maximum compression displacement result obtained according to the engineering calculation method cannot meet the engineering index

while the finite element analysis calculation method can achieve the engineering index with a large safety margin. The finite element analysis also reveals the mechanism of meeting the large compression displacement

and the calculated results are in line with the compression displacement and fatigue life required simultaneously for one GIS project. The correctness of the simulation is also verified by the type test. It is fully proved that the finite element analysis method is a more advanced and accurate design method than the engineering calculation method.