The method of clearing the foreign bodies in the transmission line with high-energy laser achieved good using effect.The laser will irradiate the insulator when removing the foreign matter,and the insulator may be damaged if the time is too long.In order to study the temperature and stress damage characteristics of porcelain insulator irradiated by laser,this paper performs modeling and calculation of different parts of porcelain insulators with different materials irradiated by laser at still and moving,and analyzes the damage chara cteristics of porcelain insulator under four kinds of materials:ordinary porcelain,alumina porcelain,zirconia porcelain and cordierite porcelain.The results show that when the ceramic insulator is irradiated by laser at rest for 60s,the central temperature is above 2000℃,which is far beyond the thermal endurance capacity of the four kinds of insulator porcelain.The tensile stress value is 251.17MPa,which exceeds the tensile strength.When the laser moves and radiates the porcelain insulator at the speed of 7mm/s,the maximum temperature is 185℃,and the tensile stress is only 2MPa.The temperature and stress are greatly reduced compared with the static radiation,and the porcelain insulator will not be damaged.It is found that the porcelain insulator will be broken when the static radiation is 16s,but the moving irradiation can effectively prevent the damage of the porcelain insulator caused by laser.