Abstract:With the aid of the soil water content field observation data (per day data from May 21,1998 to August 31,1998) during intensive observation of Huaihe River Basin and Water Cycle Experiment (HUBEX),and the per day hydrographic observation data including precipitation, evaporation,runoff of the same term, the possible way of soil water content simulation and prediction in climatic humid zone is discussed. Based on the water equilibrium theory, we got and tested a total prediction equation and a predigested one.The results show that the forecast precision of the former is 87.3%, the one of the latter is 86.3%。 So we can draw a conclusion that the rainfall, one day before and two days before, and soil humidity one day before could be used preferably to estimate the coming day soil water content.