To guarantee the service safety of reversed radial gate in water conveyance gallery of Three Gorges ship lock，the planning maintenance is conducted in the suspended shipping periods of 2021 and 2022，respectively.The coating failure and corrosion situations of reversed radial gate in water conveyance gallery are detected and evaluated during these periods.The reasons for anti-corrosion coating blistering and steel gate corrosion are analyzed in detail.The results show that the blistering and flaking of anti-corrosion coatings are presented widely on these reversed radial gates of Three Gorges ship lock.In special，local corrosion occurs on the steel gates as well as their components.The total area of coating damage and corrosion is in a proportion of about 20 percent of the detected region for each reversed radial gate.The retained organic coating and thermal-sprayed zinc layer can still play a role in preventing the reversed radial gate against corrosion，giving rise to a fact that the large area maintenance is not an urgent requirement.However，the local corrosion and coating failure areas need to be repaired in time followed by the strengthened detection and maintenance so as to avoid the threat to the safety of reversed radial gate.Meanwhile，the research in terms of high elastic，impact-resistant materials repairment and the sacrificial anode cathodic protection application is suggested to conduct on the reversed radial gate of Three Gorges ship lock，which is expected to suppress the coupling damage from erosion，cavitation erosion and galvanic corrosion.