The corrosion electrochemical behavior of composite coatings system composed of inorganic zinc-rich primer，epoxy middle paste and chlorinated rubber top coating in 3.5% NaCl solution was studied with electrochemical impedance spectroscopy（EIS）.The effect of UV irradiation on the electrochemical behavior was investigated.The results showed that the corrosion process of the composite coatings in 3.5% NaCl solution could be described in the form of four equivalent circuits.The Rc of composite coatings decreased linearly at a rate of 2.2×107 Ω·h-1 and 808 Ω·h-1 before and after 120 h respectively，but the Cc of the coatings increased linearly.UV irradiation could accelerate the aging of the coatings but did not affect the electrochemical behavior in the solution.