Based on the centrifuge shaking table test on high-cap vertical pile group and high-cap inclined pile group in dry and saturated sandy soil site，the dynamic characteristic parameters of the dry and saturated sand foun? dation soil as well as the high-cap straight and inclined pile group foundation are all analyzed，and the effects of ground motion intensity on the dynamic response of foundation soil and high-cap pile group in the dry and saturated sand fields are studied. The result shows：1）The saturated sand foundation contains more long-period components； the damping ratio of the saturated sand foundation with the same relative density is twice that of the dry sand founda? tion；The periodic characteristics of the soil-pile group model are mainly affected by the foundation characteristics， and the damping ratio characteristics of the soil-pile group model are more affected by the pile type and site characteristics；2）The straight group piles have one dominant frequency，and the inclined group piles have two dominant frequencies；3）With the increase of the input ground motion intensity，the characteristic period of the foundation soil increases，the non-linearity of the dry sand foundation increases，the saturated sand pore pressure ratio in? creases，and the acceleration response of the foundation and pile group foundation cap decreases；4）The intensity of the input ground motion increases，and the bending moment of the pile body increases. The unfavorable positions of the bending moment of pile are at the pile top connecting with cap，at the foundation buried depth of 1 times pile diameter，and at the half buried depth of the pile foundation.