Abstract: Through triaxial tests on different stress ratios under consolidated and undrained conditions, the correlation among stress-strain curve of undisturbed marine soft clays, tangent modulus, pore pressure and stress path is discussed. The results show that, under the same consolidation pressure, when the direction angle of the stress path increases, the tangent modulus will increase, the ultimate strength will change from increasing to decreasing and reach the peak value in the range of θ=0.44π～0.56π. There is a linear relationship between the unit pore pressure caused by shear stress and the unit pore pressure caused by isotropic stress. When the direction angle of the stress path increases, the pore pressure will change from positive to negative, and the ratio of the pore pressure caused by isotropic stress to the shear stress will decrease linearly.