From the following two aspects:speeding up the heat copductance and reducingthe optical absorption,we in this paper,propose a detailed means to improve the laserresistivjty of aluminum mirrors and Si windows by depositing dielectric films.In the laserinduced damage test of suing a 1.06μm infrared laser and a copper-vapor laser,the damagethresholds of samples that are being protected all have been improved,which in turn verifiesthe rationality of our protecting means.The feasibility of the method is discussed.