Abstract: The Green-Ampt model, formulas of infiltration rate and time under the condition of the layered soil profile were given in this paper. Both the equation and the continuity equation of soil water flow were used to simulate a field infiltration case and the simulated soil profiles were compared. The result show that there existed a great difference between the soil profiles simulated by the Green-Ampt equation and the continuity equation, but the difference disappeared quickly after some hours of redistribution of soil moisture. This indicates that the Green-Ampt equation can simulate the soil moisture profile of infiltration for the long-term simulation of soil moisture dynamics. Especially, when the infiltration water amount is available only, it is more advantageous than other methods.