To the high reliability requirements of the ship lock control system,an in-depth study is conducted on the application of redundancy technology in the Hunan Water Transport Construction Project- Ship Lock Project.A multi-level redundancy designis adopted,with a dual PLC(programmable logic controller)hot standby architecture deployed at the control layer.Periodic data mirroring is achieved through a dedicated synchronization module,eliminating single point failures.At the network layer,a physically isolated dual-fiber ring network is constructed,reducing the communication packet loss rate to zero.At the data layer,dual engineering node servers are used for hot standby,forming a full-stack fault-tolerant system covering the control layer,network layer,and data layer.Combined with practical engineering cases,a practical analysis and comparison are conducted.The results show that the multi-level redundancy design can significantly improve the fault tolerance of the system,achieving an annual availability rate of 99.99% for the ship lock control system and ensuring zero unplanned downtime for the “Golden Waterway”.The relevant experience and methods can provide reference for similar projects.Based on actual on-site requirements,a dynamic redundancy adjustment mechanism can be adopted to achieve partial equipment redundancy,thereby achieving the effect of “high reliability-low cost-strong adaptability”.