Abstract: Through consolidated undrained triaxial compression test, the influence of confining pressure, consolidation ratio and dry density on the static liquefaction characteristics of saturated silt soil are analyzed. The test results show that when the dry density is lower, the deviatoric stress-strain curves of saturated silt soil exhibit obvious strain softening characteristics. With the increase of axial strain, the excess pore water pressure increases and the effective stress decreases, which results in static liquefaction. When the dry density reaches to 1.58 g·cm^-3, the deviatoric stress-strain curves of saturated silt soil exhibit strain hardening characteristics, and the excess pore water pressure is negative or close to zero. So there is a critical value of dry density of static liquefaction. As other conditions are constant, with the increase of confining pressure, consolidation ratio or dry density, the peak value of deviatoric stress and the residual strength increase and the static liquefaction potential decreases. According to the effective stress path, the flow liquefaction is established as the interface of the stable zone and the unstable zone of saturated silt soil.