Abstract:At the beginning of the 21th century, the river development for hydropower launches in big scale in China. As an example, the upper Minjiang River is inspected. More than 6 power plants have been constructed along the main reach of the river. This kind of river reformation makes several reaches of the river the dry channels. The natural environment and scene viewing happens great change. The water environment gets worse and the fishes live in a dangerous status. To solve these problems, the general watershed planning must be made out immediately and be put into implement strictly. It is necessary to revise the design plan and operating rule of these hydropower plants (reservoirs). Keep river with a necessary stream flow. Save the river’s ecological system and fish species from extinction.