The inconsistency between the hydrological model and the data structure of the GIS platform has been the biggest obstacle to the integration of digital basin. This paper studied the standard method of fusion of geographic data and GIS from the perspective of the model and designed standardized geographic data interfaces and reusable geographic data components. Geographical data structure compatible with GIS was customized to solve the problem of the mismatch between the temporal and spatial characteristics and topological structure of the highly integrated GIS and hydrological model. Using component interface technology commonly used in software engineering as the core method, the common points of geographic data used in hydrological models were extracted. The model general geographic data standards and corresponding standard interfaces and components that can be accepted by the ArcGIS platform were proposed to promote the research and application of close coupling between GIS and hydrological models.