Abstract: The research progress of macro-electrochemistry on corrosion behavior of Cu-Ni alloy at home and abroad was reviewed. The effects of alloy composition, external environment, corrosion product film and initial surface film on the corrosion resistance of Cu-Ni alloy were introduced. Various theories that alloy elements affect the corrosion process by affecting the structure of corrosion product film were introduced in detail. Appropriate analysis was made on the current lack of research on the corrosion behavior of Cu-Ni alloy and the future research direction was pointed out.