As Beijing, Tianjin and other Chinese big cities are short of fresh water, the recycled water has become an important water source for the city landscape. Eutrophication is more likely to happen in landscape using recycled water than in the natural rivers and lakes. Therefore, it is significant to study the methods and technologies of water purification and maintenance to guarantee water quality meeting the corresponding functional requirements. Using the landscape restoration measures for preventing and controlling eutrophication has gained popularity since it has the advantages of ecological sustainability, low maintenance cost, and can create the ecological landscape filled with delight. This paper discussed the application of constructed wetlands, water system design and biomanipulation from the aspects of source water disposal, water system design and water quality control and maintenance, preventing the eutrophication and rebuilding natural and ecological water environment.