Abstract: In recent year,the flood disaster caused by the extreme rainfall event becomes more frequent and the formation mechanism and its cause are also changing.In order to effectively address the challenges brought by flood disasters and to promote the construction of a smart water conservancy system,this article takes the “23·7” flood in the Zhangwei River of the Haihe River Basin as an example and proposes a basin flood review scheme based on distributed hydrological and hydrodynamic models.The research results indicate that taking the distributed hydrological model with variable components in space and time to simulate the flood process of different places of the catchment is able to represent the whole runoff generation process of the event and clarify the flood causes.At the same time,the 2D hydraulic model applied for modelling the flood process in the flood detention area is validated for analyzing the flood influences and the effects of implementing certain measures.The modelling tools selected in this research are all developed in China which shows high performance with more stable parameters and better representation of the regional flood mechanism.The modelling approach presented in this paper can be satisfied to the requirements of the digital twin of flood control for having fine simulation and characterization of the entire process of flood occurrence,development,evolution.The model scheme proposed in this article can also provide technical reference for the future digital twin construction in Chinese watersheds.