Settlement observation and calculation of degree of consolidation are carried out for the soft foundation under the riprap border dike in Xuwei port area in Lianyungang.The border dike can’t break the water surface after sand quilt and drainage plate construction,and the cumulative settlement is lost when putting the settlement plate at the lowest tidal level,and the degree of consolidation is relatively small.Thus the drilling method before and after construction is applied to achieve the real settlement and degree of consolidation.Moreover,putting the settlement plate before the riprap construction with the enclosure protection method using steel reinforcement cage frame plus gravel bag,we can get the relatively correct settlement and degree of consolidation,so it is worthy of popularizing.