It lacks the dynamic monitoring for the underwater soft foundation deformation,and it is difficult to be implemented.In order to solve this problem,we carry out the reach on the dynamic monitoring technology for deepwater breakwater soft foundation deformation.We apply the way of layered settlement deformation and parallel shift of deep water level,select the shape by underwater equipment and build up observation platform above water,and optimize the installation,protection,adoption and monitoring for the equipment above water.Thus this technology can develop the dynamic monitoring technology under deep water.It has changed the traditional way of monitoring from on land to be under water.It is not only safe,reliable and accurate in data,but also suitable for large scale deep water monitoring conditions.It has significant meaning to the reference and guidance for similar soft foundation deformation monitoring projects.