?A piece of SiO2 film is formed on the monocrystalline silicon by heating.FilmAl is deposited on the SiO2 film by the means of vacuumreaction evaporation.The porous Al2O3 film is gotten by way of anodic oxidation.The surface morphology is observed by JSM35C type SEM.The resistance against humidity characteristics of Al2O3 film is obviously observed