Abstract: Based on the recent progress in international rainwater studies and the theory of five-water interaction,the authors analysed a context of rainwater resource and its utilization.A case study from the North China was given to indicate the importance and function of rainwater in eco-agriculture.Rainwater can be used by direct and indirect ways.For ecological agriculture the direct user of rainfall is of great significance in building up a retention capacity of a soil layer where the crop root system are active.On basis of effectiveness of rainwater use,authors laid emphasis on a coupling system of rainwater catchment and soil reservoir.In addition to this,the authors also suggested controlling the rainwater through soil water regulation indexes.Finally,an example of rainwater regulation taken from Yucheng comprehensive experimental station was given in the present paper.