摘要
With the development of the economy, human activities have more and more effects on natural environment. The large water conservancy and hydropower projects caused great multi-aspect influences on the environmental changes. The unreasonable activities of mankind in water resources exploitation have deteriorated the natural environment and intensified the conflicts between human beings and the nature. Environment and natural disasters have brought forward rigorous challenge on the survival and development of the mankind. The concept of environmental variation is proposed in analyzing the processes of environmental change, and the reparation methods for the river environment variation have been stated as well. Styles of river environmental variation can be classified according to characteristics of the river and of human activities. The characteristics and the consequences of the environmental variation in the estuary of Yellow River are analyzed, so have the reparation methods.