A research has been conducted on the electrochemical behavior of 2A12 aluminum alloy in NaCl solutions with different concentration, pH value and temperature by adopting electrochemical impedance spectroscopy (EIS) and electrochemical impedance spectroscopy (EIS). The results show that the influence of solution concentration, pH value and temperature on corrosion resistance of 2A12 aluminum alloy in NaCl solutions follows the following order: pH value, temperature, concentration. The corrosion resistance of 2A12 aluminum alloy deteriorates with the increase of NaCl concentration. The corrosion resistance of 2A12 aluminum alloy decreases with the increase of NaCl solution concentration; the higher the NaCl solution temperature is, the higher the corrosion current density Icorr will be, with the corrosion resistance of 2A12 aluminum alloy decreasing as well. The corrosion resistance of the alloy is the strongest under the neutral solution condition, while the worst under the alkaline condition. The corrosion current density Icorr increases with the decrease of pH value under the acid condition, with the corrosion resistance of the alloy decreasing simultaneously.