Abstract: Constructing business model platform is one of the key content of digital twin water conservancy.At present, major researches are focused on the model theory and algorithm in water conservancy, however the technics of organization and choreography of the basic models is weak, which can not support the whole process management of the digital twin simulation process of "data information", "model operation", "business analysis".Therefore, it is of great significance to study the hydraulic business model platform to support digital twin system.In this paper, the structure and functions of the model platform was proposed according to the idea of object orientation-frame design.Through the cooperative operation of boundary organization layer, general model layer, model management layer, model assembly layer and business choreography layer, the dynamic visual modeling and twin simulation analysis in water conservancy computing business were realized.The model platform effectively supports the construction and operation of the integrated dispatching management system of the Three Gorges intelligent watershed operation management platform, and can provide technical support and reference for the construction of other digital twin model platforms.