It has been observed that lots of reservoirs is become eutrophic, the cause contains artificial eutrophication, the insolation duration, and the landslide of upstream. Under the circumstances, ruin the environment, reduction of reservoirs service life, and affect the Water Treatment Plant efficiency are derived from the chlorophyll content increased gradually. “Exterminate! Algal Bloom” is dedicated early-warning and biological cycle system to maintaining water quality index of reservoir. Early-warning system will 24-hour monitoring. If the index gets unusual, we will be started up treating immediately. At the same time, we sent out the notification to staff and retrospective trace of upstream. “Exterminate! Algal Bloom” be use to control the health state of reservoir. Maintain the water index and ecological environment.