Abstract：In this paper, measures on the emergence of water blooms in some tributaries of the reservoir of the Three Gorges Project (TGP) are discussed. Heavy load of pollutant from upstream and slow flowage are believed as the main causes. To substantially cut down the load of pollutant for the time being is not feasible and ways from the power plant operation might be considered to improve this situation. By applying an unsteady flow model, the effects of peak modulations on the movement of water in the TGP reservoir are studied. It was found that certain extends of variation in power generation between day and night could induce the whole reservoir to oscillate like a tidal river. The range of such artificial tide can be as high as 55 cm. Such tides could cause considerable exchanges of water between main channel and tributaries, which is helpful to controlling water blooms in the tributaries. The power of TGP is quite sizable and good qualified for large power net modulation. So the author suggests the TGP to carry out some proto type tests to further verify the above-mentioned effects. If it could be approved, a two-win countermeasure for both power net and the water quality of the reservoir might be found.