Abstract: For the fluid-solid dynamic coupling question of foundation soil by dynamic consolidation, large deformation hypothesis on the relationship of strain and displacement was adopted to make a non-linear dynamic equilibrium equation and a fluid-solid dynamic coupling equation. In the analysis of a computed example, the distribution regularities of displacement and pore pressure of the foundation in the effective time and space were given. The maximum contact displacement was obtained. The dissipation of pore pressure was worked out. The results coincide the measured data of the highway around Jinan City of China perfectly.