Abstract: In this study, two groups of field loading tests are performed to study the influences of the cushion on the bearing capacity after the dynamic consolidation at Ganyu port in Lianyungang city. According to experimental data from two groups tests, the cushion thickness effects on the additional stress coefficient, influence depth of loading plate and average deformation modulus have been analyzed by using FEM numerical simulation. The analysis results show that the thickness of the cushion significantly reduces settlement and improves additional stress diffusion. And the additional stress coefficients would drop to below 6% of the stress at bottom of the plate at the 2 times of the plate diameter； when the foundation comes into yielding, the coefficients would be intensified. The influence depth of the plane load test would increase with the increase of the stress level at the plate bottom, not a constant ratio to the diameter of the plate. In addition, the relationships between the average deformation modulus weighted by the cushion thickness and that back-analyzed by the PLT tests are also discussed in this paper, and the results indicate that the the average deformation modulus weighted by the cushion thickness is 1.2 times higher than that of the latter, which can be used to estimate the reasonable foundation modulus.