This paper applies subjective speckle method to investigate the effects of temperature and stress on the initial process of stress corrosion of an aluminum alloy 2024-T3. Considering the sensitivity of this observational method, the roughness of surface is used to represent the degree of corrosion. Stress corrosion experiments are carried out by displacement-controlled loading on specimens of Al2024-T3 in the thickness of 2 mm board in 3.5% sodium chloride solution. The solution is controlled at several temperature levels from 22°C to 80°C. The results of experiments show that: the rate of corrosion increases fast concomitance the increase of temperature when stress is constant; at the same temperature and the load range used, the effect of stress is not very evident on the rate of corrosion; the effect of temperature is higher on the rate of corrosion in the stress corrosion than that in general corrosion without stress.