At present， the informationization needs of water conservancy project management are increasing.The important way to realize the refinement and intelligent management of water conservancy projects is to combine the powerful 3D GIS and geometric and semantic BIM data to form integrated macro geographic environment data and micro-architecture，to refined three-dimensional model of water conservancy engineering of information data.This paper outlines a variety of integration methods，mainly introduces the method of integrating the two based on SuperMap software platform，and takes a water conservancy project in Jiangxi province as an example to show the integration results.Among them，the fine model data is constructed by Revit software，and a comprehensive application concept is proposed combining the fine 3D model with current new technologies such as the internet of things．