It is one of the most important steps in determining the value of model parameters in the analysis of the seawall settlement on the soft ground by numerical methods. Combining the seawall engineering data of the Donghai bridge, we analyze the parameter sensitivity of the modified Cambridge model in the calculation of seawall settlement. The results show that the slope of the initial compression curve λ and the slope of the failure curve M have the greatest influence on the seawall settlement. When the values of λ and M fluctuate in the range of ±20% , the changing rate of settlement also fluctuates in the range of ±20% .While the rebound slope κ、permeability coefficient k、Poisson’s ratio v and intercept ea have very little influence on seawall settlement. When these parameters fluctuate in the range of ±20%, the changing rate of final settlement only fluctuates in the range of ±1%. Besides, although permeability coefficient k can’t influence the final settlement, it has a great influence on the consolidation behavior of the foundation. As a result , in order to analyze the problem of seawall settlement more accurately , more attention should be paid on the values of λ, M and k.