The complex formation and distribution of soft soil in large-scale land reclamation projects pose significant challenges in terms of its physical and mechanical properties,which have a significant impact on the foundation treatment plan.Taking the east operation area of Yantian Port as an example,a large amount of in-situ testing,geotechnical test data before and after foundation treatment,as well as experience in the Shenzhen area,are studied and technically analyzed.The physical mechanics and distribution characteristics of the soft soil layer in the area are summarized.The results show that after preloading treatment,the distribution of the silty soft soil layer is very small,and the early silty soil has become silty clay,with significantly improved mechanical properties.In response to the lack of shear indicators in some soft soils,recommendations are proposed based on regional experience and in-situ test values.Based on the comparative analysis of different foundation treatment schemes,it is proposed that attention should be paid to issues such as broken zones in the preloading reinforcement of hydraulic fill silt.It is concluded that after preloading treatment,dynamic compaction method or dynamic compaction replacement method can be used as treatment schemes,and the foundation reinforcement effect is good.It can provide guidance for determining the physical and mechanical parameters of similar land reclamation projects and selecting foundation treatment plans.