In order to improve ability of resistance to erosion of high temperature propellant gas on surface of parts of a product and solve the boattail drop-out problem arose from product approval test, surface treatment process of aluminum alloy boattail was adjusted from original general anodic oxidation to micro-arc oxidation, and corresponding process test was carried out, take slow-rise and slow-drop constant pressure stage controlled mode as main running mode of batch production. After test, each property of micro-arcoxide film obviously exceeds anodic oxidation film, can meet product quality requirements.