Abstract: The cross-dyke structures around Poyang Lake area are mainly used for water diversion and transportation, and the vital component of Poyang Lake flood control system with dyke.Based on the work of flood management in 2020 and 2024 in Poyang Lake basin, this paper summarized and analyzed the identification, detection, monitoring and emergency protection methods of the cross-dyke structures risk.That can be divided into building structure, gate and soil-structure combination three categories by site of occurrence.Then the disposal methods of three categories risks of the cross-dyke structures were analyzed and summarized in detail.At last, the example of the risk of Lewei sluice in 2020 was introduced, including the process of the risk, the monitor and detection of the seepage, the disposal methods of the risks.The results indicated that scientifically selecting rescue methods based on the type of risk can effectively carry out emergency protection for cross-dyke structures.The research results can provide a reference for the flood management, and also provide ideas for the research of new emergency rescue technology.