Abstract: According to the monitoring data, the settlement regularities of the existing Lingni seawall were analyzed. Furthermore, the total settlement and the residual settlement after widening engineering by two different embankment fillings, and the differential settlement between the existing seawall and the one to be widened were calculated and compared; the deformation regularities of the seawall after widening were figured out, which proffered the primary design and execution reference for the widening engineering of Lingni seawall.