Abstract: This paper introduces a deformation defect of a 220kV transformer bushing terminal. The mechanical properties of the terminal, such as composition, hardness, bending and tensile, were tested, and static simulation analysis was carried out on the model of the bushing head structure. It is expounded that the bushing terminal is a stress concentrated area, and its mechanical properties are insufficient, which leads to the bending deformation of the terminal due to the stress exceeding the yield strength of the material under the action of gravity and wind load. Suggestions for improvement were put forward to provide reference for bushing operation and maintenance.