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According to the transportation load's characteristic and consideration that the simulation realizes the question, this article uses the existing achievements in scientific research and other people's experimental conclusion and carries on the numerical simulation using the ABAQUS finite element software. This paper will study the question that is simplified as the three-dimensional model and use the static law to analyze the dynamic value question, respectively by static load, motion constant load and sinusoidal load to form simulation transportation load. From the existing elastic plasticity soil body, these construction relations can be obtained and to establish the subgrade soil finite element model, through model parameter's determination, the numerical analysis and the computation of the subgrade soil under transportation load function power response can be carried on. Thus the subgrade soil dynamic performance under transportation load function can be obtained.