The hydraulic steel gate have been in the complex operating condition for a long time.It often causes corrosion damage due to the changes of various natural conditions or environmental.If not treated in time，it may endanger the safety of the whole steel gate.In this paper，based on the research direction of the working behavior of the existing hydraulic steel gate after corrosion，the corrosion mechanism and performance degradation law of materials，load action and statistical characteristics，structural degradation law and residual life prediction，reliability analysis，component and structure maintenance and reinforcement strategies are described and summarized，and the future research direction are prospected．