As a key deep-water port for the development of Guangzhou,Nansha Port Area in Guangzhou has revealed the widespread distribution of deep soft clay in the area,with local soft soil depths exceeding 30 meters.The characteristics of soft clay in the area are mainly affected by two large-scale transgressions,regression and the Pearl River water system.The upper soft clay is mainly composed of silt,with a thickness of 10 to 20 meters,mixed with thin layers of fine sand or strip-shaped sandy layers.The lower soft soil is mainly composed of silty soil,containing organic matter and decomposed wood fragments,with a thickness of 4 to 8 meters.Soft clay parameters are important indicators that affect the construction of engineering in Nansha Port area.Using in situ test might be affected is less and can accurately present the mechanical properties of soft clay.By comparing and analyzing various commonly used in-situ test methods,suitable in-situ test methods for deep clay in Nansha Port area are proposed.In engineering practice,different in-situ test methods are used to obtain engineering parameters,especially for the vane shear test,aiming to provide reference for similar soft clay investigation,design,and construction in the region.