The hydraulic gate system consists of a complex hydraulic hoist system and some large steel gate metal components,which is characterized by heavy load and complex working conditions.The corrosion damage of large metal components and failure of hoist transmission will lead to system failures,which make the gate failure mode complicated and difficult to predict.Aiming at the problems of difficult interaction,poor compatibility and high complexity of each subsystem of the gate in the traditional modeling process,based on multi-domain unified modeling method,Simscape language was used to establish the multi-domain digital model of the arc-shaped gate,through the opening curve deviation control strategy and subsystems conversion interface to realize the co-simulation.According to the geometrical similarity of a hydraulic building,an experimental platform was set up to carry out experiments to dynamically check the real-time opening of the gate and the driving force of the servo cylinder.At the same time,the failure of the hydraulic hoist,the leakage of oil and the damage of the curved body were simulated based on multi-domain model.The results show that the proposed multi-field coupling modeling method of radial gate satisfies the set error threshold and has high reliability,which can be used to study the influence of common faults form on the operating characteristics of the gate mechanical-hydraulic system,and also provides reference for the selection checking and performance optimization of the hydraulic system in the design stage.