Abstract: Boiling and sulfuric acid anodizing process were conducted on the surface of T6061A1 alloy cladding samples which had experienced the same manufacturing cycle about fuel tube and been heated for 1 h at the temperature of (450±25) ℃ for foaming annealing test. The thickness and surface morphology of preformed membranes were detected, as well as the autoclave corrosion tests were done. The result shows that boiled preformed membrane thickness is about 500 nm, and the resistance performance of autoclave corrosion is far better than that of the anodic oxidation preformed membrane. With the increase of the thickness for anodic oxidation preformed membrane, the membrane thickness increment and weight per unit area increase after each autoclave corrosion cycle.