Abstract:A mathematical model of soil water infiltratoin was built according to the Decy’S law and energy conservation energy principle．For establishing this model，soil mois～ture parameters were measured in the laboratory．Process of soil water infiltration in different woodlands was simulated．The paper showed that computer simulation is con～sistent with the experimental results for accumulative infiltration volume and infiltration rate．Infiltration profile maps drawed through simulation results objectively showed the whole process of infiltration．