The water cycle processes in large scale were studied by many scientists.

Forest fire effects on hydrology through indirect ways, which mainly represented through vegetation, letter, soil and ecological environment changes after fire and their effects on water cycle ,water quality and aquatic organism.

Based on the observational data from the positioning experimental plots,this paper sets forth the dynamic characteristics of water cycle of latored soils in the south subtropics.

The artical takes water transporting from oceans through atmosphere to the continents as a key link of water circulation, which consists of evaporation, precipitation, atmospherical circulation and runoff as its main constituents, related closely with climate and its change.

So when calculating the amount of globe atmospheric water, the cloud water content can be ignored;(2)Cumulonimbus is abundant of water,but calculation shows that its precipitable water is less than 3 mm;and (3)There are 1 000 mm water precipitated from the cloud every year, but the precipitable water of cloud is exiguity,so water circulation is very.

The concept of irrigation hydrology is pointed out in the research on hydrological cycle at different scales in irrigation area and interaction of irrigation-drainage and hydrology.

The phenomena and process about the large scale interaction between ocean and atmosphere and their impact on global hydrological cycle and climate are introduced.