The method of clearing the foreign bodies in the transmission line with high-energy laser achieved good using effect. To remove the foreign bodies

laser may irradiate the insulator directly

which may damage the insulator.In order to study the temperature and stress damage characteristics of porcelain insulators when clearing the foreign bodies in the transmission line with high-energy laser. This paper performs modeling and calculation of different parts of porcelaininsulators with differentmaterials under laser irradiation. The damage characteristic ofporcelain insulators using four kind porcelains

alumina porcelain

zirconia porcelain and cordierite porcelain are analyzed

the situation of laser irradiation on steel cap of porcelain insulators are involved. The results show that when laser irradiates the porcelain part of insulator

the central temperature of the radiation point on the surface of the alumina ceramic insulator is the lowest among four kind insulators. The temperature of the porcelain part drastically decreases from the center of the laser spot to the edge of the laser spot. The stress distributes on the surface of porcelain insulators is two-humps type. When high-energy laser irradiates the steel cap of the insulator for 60 s

the surface temperature of the steel cap is low

which may not destroy the insulator

however

the stress at the steel cap reached 821 MPa

so the insulator is under the risk of being destroyed.