The article discusses how China is shifting towards quality-based water supply to address water quality issues. This approach focuses on using high-quality water more efficiently and replacing traditional water supply methods. The development of quality-based water supply is categorized based on water quality, scale, area, and mode of supply. The history and different uses of quality-based water supply are explored, including for industrial and domestic purposes, reclaimed water, tap water, and purified water. The article also highlights existing problems such as water quality issues, pricing, and negative effects of quality-based water supply.