Abstract: The experimental studies of the soil-water characteristics curves(SWCC) have been carried out using different urea concentrations， with Tempe pressure membrane apparatus. And the experimental results are fitted by Van Genuchten (VG) model. Based on these VG models， the relationships between parameters of VG models and the urea concentration are obtained by linear regression. Finally， a new VG model considering the impacts of the urea concentration on SWCC is established in the experimental studies. The new model shows that the urea concentration effects parameter n is larger than a parameter α； the higher the urea concentration is， the smaller the parameter α is and the larger the parameter n is. The studies have made up for the deficiency of other methods which can not consider the urea concentration, and are very significant for the supplement and development of the theory and the experimental methods of SWCC. SWCC model developed by the authcrs does not consider the effects of the urea concentration upon the solute suction, nor the influence mechanism of the urea colution on the soil-water characteristics curves. The two issues have to be further studied in the future.