In order to establish the correlation between physical properties and mechanical properties, we obtain the ratio of undrained shear strength and effective pressure Su/p′0 under the anisotropic consolidation triaxial shear test, analyze the correlation between Su/p′0 and liquidity index/plasticity index/liquid limit, and establish the relative formula on normally consolidated soft soil Su/p′0 and consistency index at the estuary of the Pearl river delta, and assess the normalized behavior.