The laser-induced damage threshold(LIDT) of optical coating is a limited factor for development of a high peak power laser. The automatic damage testing facility was built to determine the LIDT of optics at 1 064 nm and 355 nm.. The cleanning and processing procedure of the substrate and coating technique were improved, and the damage resistance of high-reflective coating at 1 064 nm was increased. The laser-induced damage threshold (LIDT) of optical coating is a limited factor for the development of a high peak power laser. The automatic damage testing facility was built to determine the LIDT of optics at 1 064 nm and 355 nm. The cleanning and processing procedure of the substrate and coating techniques were improved, and the damage resistance of high-reflective coating at 1 064 nm was increased.