Abstract: Water conservancy model is a key mean to accurately depict the twin process of various businesses in the digital twin platform.The existed models are often designed for local technological points with dispersed technology road, in which there is a scarcity of an integrated technological system of water conservancy business models.Based on the construction, development and application requirements of the water digital twin construction for the water conservancy model, this paper puts forward a layered construction technologies such as fine-grained decomposition, nested reuse, assembly and arrangement of the water conservancy business models, and packaging and publishing technology based on micro service, and business support technology for twin scenarios.This provides a feasible approach and experience reference for the construction, application, and full life cycle management of the model library in the conservancy digital twin platform.