Abstract:On March 30th, 2022, the Ministry of Water Resources issued the Technical Guidelines for Development of Digital Twin of Hydraulic Engineering (Trial), to guide the development of digital twin of hydraulic engineering. This article introduces the importance, connotation, framework of the development of digital twin, as well as the key contents such as data baseplate, model base, knowledge base, digital twin engine, monitoring perception, communication network, engineering automation control, engineering safety intelligent analysis and early warning, network security system, operation and maintenance system etc., and it also explains the applicable conditions of development indicators and requirements for co-development and sharing.