The dynamic compaction finite element equation and the numerical analysis method of soils subjected to the impact loading are established. Ansys-Ls-dyna software is used to analyze the soil dynamic response of Shanxi Fertilizer Factory's layer soils subjected to the impact loading. The distributed characteristics of displacement and its change courses are studied and compared with experimental figures. It proves that the calculation results approximate the experimental data. It results that the displacement influence scope of the impact load in the soils is an ellipsoid. The lateral reinforced radius from the center of loading is 2D (D is a the diameter of tamping hammer)

the reinforced depth under the center of loading is also 2D or larger.