In the paper, the comentropy theory is extended and applied to analyze the structural characteristics and law in the process of evolution of hydrologic cycle.

Advances in the research on hydrological cycle and water in the China;

Advances in research on hydrological cycle and surface water;

Evaluation of ecological water requirement based on hydrological cycle analysis;

The concept and implied meaning of ecological water demand are discussed,the advantage and disadvantage of traditional quantification methods are commented,and it is indicated that the calculation of ecological water demand should be departed from the angle of water cycle and establish the object of maintaining the most basal health level of ecosystem.

This study aims to explore water cycle of typical grassland in source region of Yellow River.

Dual differentiation of hydrologic cycle and its ecologic results in Manas River Basin of Xinjiang;