Abstract: Due to the differences in the inputs of different business types of water conservancy professional models in terms of water conservancy engineering object types，model static parameters，dynamic boundary conditions，etc.，it is not possible to adopt a unified construction mode for generalization，which greatly affects the re-usability of the model and reduces the level of generalization of the digital twin platform.In this paper，we propose a modeling technique for water conservancy professional models，by extracting the type，organization，and format characteristics of multi-type professional models on the input side，and utilizing the information description characteristics of metadata，we establish a standardized metadata set for the modeling process of water conservancy professional models.Further，we design and realize a generalized modeling process interface based on the metadata set，which can support the modeling of water conservancy professional models.The standardized metadata modeling technology proposed in this paper was successfully applied to the modeling process of the forecasting and dispatching professional model of the Digital Twin Yuecheng Reservoir，and the metadata avoided the differences between various types of input data of the model，which improved the efficiency of modeling and the reusability of the model.