In arid and semi-arid regions, condensated water is one of the most important sources of water supply to maintain the ecosystem function. In this paper, we reviewed the effects of meteorological conditions, topographic environment and vegetation attributes on the formation and yield of condensated water in arid and semi-arid ecosystems, as well as the mechanism of condensated water's influence on ecosystem function. The relationship between the condensated water variation and compositions of arid and semi-arid ecosystem was also discussed from the aspects of vegetation growth, biological soil crust, small animals, microorganisms, and surface water-heat processes. Finally, several suggestions for future research on the condensated water were provided in this paper. We should improve the observation and data analysis of condensated water in a long time series in future research, systematically discuss the comprehensive effects of the condensed water on ecosystem functions in arid and semi-arid regions, and further strengthen the study of the relationship between condensated water and ecosystems under climate change.