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In the past few years, the quality of water has been severely polluted by exceedingly untreated industrial and sanitary waste water, which has caused the ecological imbalance. It is a cyclical system with some solar device which can automatically purify the water. Each hemispherical solar device equips the gasbag. It makes devices float on water, and the device can absorb sunlight and save solar energy to supply the interior instruments, which can monitor the water quality. We can raise some purification plants above them. In summery, with the methods combined with ecology and technology to purify the water quality, lakes can "have a rest".