Abstract: The author obtained the corresponding relation of rayleigh wave velocity and dynamic compaction based on the profound analysis of the test data after the transient ralyleigh wave test(four mouths after dynamic compaction)on the earth-filled(silty clay used as filled material)dynamic compaction test area.The results showed that in the silty clay used as filled materiall foundation,excess pore water pressure dissipated with increasing dynamic compaction; bearing capacity of foundation increased obviously in the 26d after dynamic compaction; Subsequently,increased speed was slow and tended to be stable 107d after dynamic compaction.