A technical method of increasing water resources and reducing water consumption was presented. The work of water-saving irrigation should be regarded as a system of engineering integrated with several technologies including planning and designing, product manufacturing, agronomic knowledge, service management and so on. New technologies relevant to water supply, water delivery and water distribution were introduced, and their development trend in the 21st century was described. The problems that need to be observed, analyzed and solved were also proposed from the systems engineering viewpoint of water-saving irrigation. 