Now the exploitation of waterpower is limited by its water and hydropower resources. The power net will be short in peak and surplus in valley. Supplementing pump storage plant into the ordinary hydropower, the surplus valley power can be changed into the precious peak power. By this kind of expectation the surplus power may be renewable and is favorable to the sustainable development. As the storage measures included, the hydropower is favorable to the sustainable development of the various energies, including nuclear & wind etc renewable energy. Hydropower is an important supplement to the environment. We have to pay great attention to the risk analysis, risk design and risk management. The difficult problems are discussed.