Abstract: To address issues such as the lack of a standardized framework for data organization and weak data dynamic response capabilities during the construction of water conservancy digital twin business scenarios, this study proposes a business scenario-oriented water data model based on an analysis of the current status of water data models and the characteristics of water conservancy businesses. In terms of architecture, the model expands horizontally according to business domains and decomposes vertically from the domain layer to the unit layer by step based on nested business relationships. Specifically, the unit-layer data model is constructed for unit business scenarios: by introducing the dimensional modeling theory, the relevant elements of unit business scenarios and their interrelationships are transformed into one fact table and multiple associated dimension tables. On this basis, the unit data models are instantiated and combined according to the water conservancy object flows and business flows, thereby forming data models for complex business scenarios，and supporting the execution of business scenario calculation flows.This proposed model can fully and standardly describe the characteristics of business scenarios. It can efficiently organize relevant data through "one-time modeling and modular assembly" and support the adaptive streaming construction of water conservancy twin services. .