This paper summarizes the research progress of energy saving and consumption reduction in municipal water supply network and building water supply system by using intelligent technology. By summing up the influence of sensor and communication technology on intelligent leakage detection, this paper reviews the development history of hydraulic simulation software, expounds the progressive process of intelligent optimal scheduling technology of water supply network. and evaluates the role of intelligent water meters in real-time monitoring of building water supply systems. Based on the challenges faced by intelligent technologies, this paper makes a prospect to the future directions.