This book is compiled based on a systematic summary of the scientific research results on agricultural water conservation conducted by the Beijing Water Conservancy Research Institute during the period from the Sixth Five-Year Plan to the Tenth Five-Year Plan. The book has nine chapters in total, including: basic situation of the research area, water-saving irrigation system and irrigation technology for grain crops, water-saving irrigation system and irrigation technology for fruit trees, water-saving irrigation system and irrigation technology for vegetables, water-saving irrigation system and irrigation technology for pasture, rural water management system and model, development and application of automated agricultural water management equipment, development and application of water-saving irrigation expert decision-making system, and regional water resources evaluation method based on GIS technology.