Aiming at the problem that changes in the quality of factory water can break the relative balance between the interface layer of the pipe wall and the original transmission and distribution water quality to produce yellow water, this technology establishes a water source from two aspects: water corrosivity evaluation and the stability evaluation of the pipe network itself. Prediction and evaluation method for yellow water in the pipe network under switching conditions; At the same time, a comprehensive technical plan to effectively control yellow water in the pipe network is proposed from the aspects of identifying the stability of pipe scale in the pipe network, regulating the water quality of the pipe network, and controlling the release of corrosion products from the biofilm structure on the pipe wall. The technical contents include: (1) Multi-water source zoning scheduling and deployment technology. (2) Water quality adjustment and disinfection process control technology to control water quality stability and pipe scale stability. Research and form a stability evaluation and prediction method for the water quality of the pipe network under the condition of frequent switching of multiple water sources, and proposed a stability identification technology for water sources and pipe network under the multi-source water supply of the South-to-North Water Diversion Project, which realized the prediction of yellow water in the pipe network under the condition of water source switching; A comprehensive plan for yellow water control technology focusing on regulating the inlet water quality of the pipe network and biomembrane has been established, and application demonstrations have been carried out in some pipe network areas in Beijing City. The application of the results has effectively ensured the safety of water supply in the capital, avoided the occurrence of yellow water caused by frequent switching of water sources between 2009 and 2012, and effectively alleviated the contradiction of water resource shortage in Beijing City. Research and engineering application have been closely integrated, achieving important social and economic benefits.