To resolve the water resource shortage, the water reuse technologies are of key importance. But in nowadays, the water reuse is only limited in large cities and industry fields. Many residential communities and constructions have not build water reuse systems. The article briefly describes the features and utilizations of domestic and foreign water, analysis the profits and disservices and scale of large and small recycled water. For the current domestic situation and water resources and promote water reuse status and problems considering the urban size, economic status, urban planning and norm-setting and other factors, it advocate that the development of water should start from small to large, from micro to macro, researched the precedent of the scaled provision about small water in Japan and Beijing and proposed the conclusion that to prompt reasonable division of small recycled water and achieve the optimal balance of large and small recycled water in order to promote better water utilization, and thus weaken the limits of water shortage in the development of urbanization.