To guarantee water quality of waterscapes in Shimao Butterfly Bay of Kunshan City, maintain the water quality above the grade-IV specified in National Standards of Surface Water Environmental Quality (GB3838-2002), and achieve the low-cost, long-term and sustainable water maintenance, basic principles of ecological engineering and aquatic ecosystem balance theory were taken as the guidance of water treatment, and several water treatment techniques were applied, for example, configuration of water plants, raising aquatic animals, and putting in microorganisms. In addition, primary water supply, water replenishing and flood drainage were considered in the construction of landscape rivers to ensure landscape effects of the lake. Through the long-term water quality guarantee of principal waterscapes in Shimao Butterfly Bay, rewarding attempts were made in guaranteeing water quality of waterscapes, and favorable effects were achieved.
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