By studying the essence of river life and river health and analyzing all the requirements of river itself, human and river ecosystem, it proposes the major healthy indicators of the Yellow River at present as continuous flow, free-and-safe riverbed, suitable water quality, acceptable river ecosystem and certain water supply capacity.

In order to investigate the influences of dams and water gates on the river ecosystems of the Huaihe River,the biological indexes were employed to assess the present status of river ecosystems on typical dam and water gate sections in the Huaihe River.

This research result will play an key role to improve water environment and river ecosystem of Weihe River.

Primarily discussion on structuring technology of buffer zone in eco-stream;

Based on these problems,the concept of ecological river was put forward and the .

Crises of river life and formation of river ethics;

The theoretical framework for "sustaining the Yellow River healthy life" is proposed on the concept of "river life" and has been gradually improved.

In the process of social economic development, in pursuit of the social function of the river, human being have ignored rivers\' bearing capacity and exploited rivers unreasonably for a long time, which caused a serious crisis of the river life.