This paper proposes a new anti-ice-flashover composite insulator with the function of lightning protection.By the finite element analysis software（ANSYS）

the potential distribution and the electric field strength distribution of this new composite insulator under clean and icing conditions are simulated.The results show that the insulation part of the insulator withstands most of the entire voltage under the clean condition

leading to an apparent decrease of the aging course of ZnO varistors.While under icing condition

influenced by resistance of ice band

the insulation part withstands almost 50% of the entire voltage and potential distribution changes adaptively

so it ensures the ability of anti-ice-flashover of the insulator.