The textbook is designed for the main problems involved in the practice of students in Water Supply and Prainage Science and Engineering, so that students can better practice with questions. The content contains utilization and protection of water resources, water intake, distribution and delivery facilities, traditional water treatment process, combined and separate sewer, wastewater pretreatment, primary wastewater treatment system and secondary wastewater treatment system, sludge treatment and disposal, and sewage advanced treatment system.The textbook focuses on the principle of the overall knowledge of water supply and drainage, the key points, problems and precautions in the actual investigation and practice of students. We emphasizes the importance of the design of teaching materials for the practical training of water supply and drainage. And the textbook combines the latest improvement on our understanding of basic phenomena as well as research and application of new technologies.