Sponge city is a concept originated from the use of 'sponge' to describe the absorpting function of cities. Population researchers in Australia were the first to use the sponge metaphor in expressing the adsorption of polulation from cities. In recent years, the expression is more often used to describe the regulation and storage capacity of cities or field. The theory of 'sponge city' has been applied in several design and planning practices and this book will cover the critical technologies of sponge city, illustrated with case studies. Theoritical issues and practical cases are closely integrated in this book, taking landscape as a new form of infrastrcture and introducing a greener, wiser way of life.