Muddy soil in new seawall engineering area has properties of high water content and low bearing capacity.For the purposes of foundation and structure stability during the construction of seawall,the surface settlement,deep horizontal displacement,layered settlement and pore water pressure observation projects are stetted to reasonable control the construction schedule,and to prevent shear failure of the foundation.The results show that there is a large settlement in the early stage of project,but monitoring parameters are within a reasonably safe range；the settlement rate is slow during the later period of the construction,the compression deformation of embankment tends to be stable,seawall is stable and secure during construction.