Abstract: Anodic film on SiC_P/Al alloy (2A12) composites was obtained by adipic-sulfuric acid process. The cracking behaviors and corrosion resistance of anodic film on SiC_P/2A12 composites which was obtained at different anodized temperature (15-35 ℃) were analyzed after temperature shock.The micro morphology of anodic film on SiC_P/2A12 composites was observed by using FE-SEM before and after temperature shock. Electrochemical impedance spectroscope (EIS) was used to study the corrosion resistance of anodic film on SiC_P/2A12 composites before and after shock. The results show that the effect of temperature shock on anodic film on SiC_P/2A12 composites obtained at different anodized temperatures was different.After treating by temperature shock, the crack density of anodic film on SiC_P/2A12 composites gradually increases with the anodizing temperature increasing. The corrosion resistance of anodic film on SiC_P/2A12 composites after temperature shock obtained at anodized temperature of 25 ℃ is best. The temperature shock resistance performance of anodic film on SiC_P/2A12 composites is superior to that of 2A12 aluminium alloy oxidation film.