The influence of climate change and human activities on hydrological processes includes two physical processes with different properties and different space-time scale. The impacts of any human activities on hydrological processes cannot occur independently from the influence of certain climate conditions. It will be helpful to understand the consequences of peoples own actions if the restriction about climate variability and change to human activities is revealed. Coupling the two processes into the climate system will pave the way for future research of the interaction between natural water cycle and social water cycle. Examining the results from previous studies,this paper suggests (a) to improve the hydrological model in description of the hydrological effect of warming climate;(b) to develop the quantitative calculation method about natural evaporation and the extra evaporation from various human activities in land surface model, and (c) to consider how to integrate them into the water and energy balance equations of the atmosphere and land surface. All of the aforementioned problems must be addressed in the course of building a coupling model between natural water cycle and social water cycle. Thus,to provide basic supporting data for this kind of coupled model study,this paper suggests establishing databases coveringnatural,andsociety,conventional and unconventional information decentralized on the network.