Abstract: In order to promote standardized collection, accurate identification and efficient application of hydrological multi-source data, and accelerate the construction of hydrological big data platform, in view of the problems of multiple codes for one station and different codes at the same station in Zhejiang Province, we propose a geogrid-based coding method for hydrological elements considering spatial position. This method divides the whole region of Zhejiang Province into two levels of geographic grids, a basic grid density of 1km×1km, and a fine sub-grid of 100m×100m. The grid coding rules are formulated and all hydrological elements’ relationship with grid coding is established. With the help of aforementioned grid-based method, affairs collaboration and refined analysis of various hydrological elements can be efficiently achieved. This method has the advantages of automatic generation in advance, convenient data exchange and sharing, and data application and expansion, which lays a foundation for the subsequent geospatial fusion analysis and application of hydrological data.