Abstract: The descriptions of this paper is based on field experimental research of water transfer mechanism in soil plant atmosphere continuum (SPAC), which was involved in a key project under the title of “Scientific Base of Applied Research on Water saving Agriculture in the North China Plain” supported by National Natural Science Foundation of China (NNSFC). Water movement in soil plant atmosphere regarding hydrological cycle includes the interactions between surface water, groundwater, soil water, plant water and atmospheric water. Some detailed experimentats have conducted in recent years.These issues include following four parts: (1) simulation of soil water movement and calculation of soil water by using large sized lysimeters; (2) studies on field evapotranspiration regulations under water saving conditions; (3) the interface processes of water fluxes and water saving regulation in SPAC; (4) development of integrated model of water movement in SPAC. Three representative experimental stations of CAS at Luancheng (Hebei province), Nanpi (Hebei Province) and Yucheng (Shandong Province) with different conditions of buried groundwater tables 26, 6 and 2 m, respectively were selected to conduct the experiments and observations on water and energy processes of groundwater, soil, crop and atmosphere system, which carefully scheduled to observe at same time. Several interface processes of water fluxed in SPAC including interfaces between soil and root, plant and atmosphere, soil and atmosphere, soil water and groundwater with different physiological and ecological conditions involved in this study. Finally the author draws brief remarks as follows: field water systems consist of several links of hydrological states being of complexity, and the preliminary outcomes of this study illustrated the applicability in water saving agriculture. The development of interface hydrology study could be very helpful to better understanding of hydrological cycle mechanism. This would create a new aspect of hydrological science.

Key words: Soil Plant Atmosphere Continuum Water fluxes, Interface processes