Corrosion of the aluminum alloy is one of the main reasons for the degradation of the aircraft. Early corrosion, it's most pitting and volume hardly changed. Combined with these characteristics, we used optical fiber gratings sensor, designed two monitoring structures such as the leaf type and stress bound type, and researched on the corrosion situation of aluminum alloy through the high precision grating demodulation system. Before corrosion, stress is applied in the fiber gratings and gradually released with the corrosion. Corrosion situation of the aluminum alloy can be gotten by measuring the drift of the wavelength of sensor. According to the experimental results, it is shown that the real corrosion situation of the aluminum alloy based on optical fiber gratings corrosion monitoring structure, and optical fiber gratings has characteristics such as small volume, anti-electromagnetism interference and anti-corrosive, so it’s very suitable for corrosion monitoring of the aircraft.