Abstract: Simulation and visualization can provide intuitionistic shortcut for science research methods for plant growth. The three-dimensional architecture and distribution of root systems in the growth medium is crucial to the utilization of water and nutrient. For avoiding the invisibility of the environments of the root systems and the influence of the secondary factors, studying quantificationally and intuitionistically the root systems varying with the soil environments, the interaction of growth functions, morphogenetic models and visualization methods was realized to build the three-dimensional visualization modeling system of the plant root systems. The growth functions of the soybean root systems were proved as the three multinomials that were got by the former research, the morphogenetic models were built by the generative rules of differential L-systems, a string smoothed of the truncated cones were used for modeling the every real root. As soon as the coefficients of the three multinomials of root system growth functions were input, the controllable graphics and the geometrical parameters of the growth of the root systems could be shown veritably and continuously.