Ti-alloy has widely used in the manufacture of advanced marine equipment. However, in practical applications, galvanic corrosion may tend to happen when Ti-alloy is coupled with dissimilar metallic materials, which significantly threatens the reliability and service lifetime of marine equipment. In present work, the galvanic corrosion behavior of coupling pairs of Ti80 alloy with four commonly-used metallic materials for marine engineering, such as 921A steel, B10 Cu-alloy, 6061 Al-alloy and 40Cr steel respectively, in NaCl solution was studied via weight change measurement, open circuit potential measurement, potentiodynamic polarization measurement and electrochemical impedance spectroscopy as well as 3D optical profilometer, Fe-SEM and XRD. It is found that galvanic corrosion may occur when Ti80 alloy is coupled with any one of the four metallic materials, while the galvanic corrosion does not alter the corrosion behavior of the anode material for the four pairs. Even though, the difference of free-corrosion potentials between the two metallic materials of the coupling pair will play the role as driving force for electron transfer of the coupling system, which may lead to the accelerated dissolution of the metallic material acted as the anode. By taking the free-corrosion rate of the four test metallic materials as reference, after being coupled with Ti80 alloy the increment in corrosion rate of the four metallic materials can be ranked as follows: 6061 > 40Cr > 921A > B10. Besides, it is noted that there is not positively correlation between the galvanic corrosion effect with the potential difference of the coupling pairs.