Pitting corrosion is a typical damage of aircraft aluminum alloys structure in the service environment which could initiate crack under the fatigue load and shorten the structure fatigue life.In order to fully understand the function mehcanism of the pitting corrosion to the corrsion fatigue life ,the growth behavior of aluminum alloy pitting corrosion should be studied.Based on the electrochemical corrosion mechanism and the microstructure, the size of corrosion pit was chosen as research parameter, the model of aluminum alloy pitting corrosion growth behavior was researched, and the result between model calculating and the LY12CZ pitting corrosion test was comparatively analyzed, which showed that the established model could reasonably reflect the evolution rule of aluminum alloy corrosion pit size parameter.