This book focuses on displaying and summarizing the representative achievements of the public welfare scientific research, public service and technical consulting projects undertaken by the Beijing Water Science Research Institute (2012), including agricultural water conservation, recycled water utilization, water resources management, urban rainwater management and utilization, sewage treatment and sludge resource utilization, and compliance with water quality. Guarantee, soil and water conservation and water ecological restoration, water engineering monitoring and modeling, water development strategies, etc., Aiming to achieve public welfare scientific research to lead the development of water science and technology, public services to support government decision-making, technical consultation to promote the development of water science, and provide the latest scientific research information and technology exchange platform for the majority of water workers