Abstract: The groundwater resources have been seriously deficient since the 1980s in the plain area of Beijing.So it is very necessary to reduce the loss of runoff and evaporation and to use flood water and runoff for recharging the local groundwater.In this paper,about data of twenty years on rainfall and groundwater level observed from the water resources experimental area in south-eastern suburb of Beijing was comprehensively processed.The storage capacity and regulating capacity of 0-3 m layer of soil reservoir in the different hydrologic years were analyzed and calculated.The hydraulic force connections among the different levels of groundwater were revealed.The variation relations between phreatic water,confined water and precipitation were studied,and at the same time it proved that rainfall affected the shallow groundwater beyond one year.