Abstract: The consolidation deformation characteristics and analysis methods of unsaturated soil are the key issues in the field of soil mechanics.The unsaturated soil is a kind of three-phase porous medium.There is not only the interaction among the solid phase,liquid phase and gaseous phase,the mechanical effect from complicated shrinkable film but also the morphological and chemical change in soluble mineral property.Therefore,it is not enough to only establish an association among the solid phase,liquid phase,gaseous phase and shrinkable film by suction characteristic quantity in the study on mechanical behaviors of the unsaturated soil.The solid phase,liquid phase,gaseous phase,shrinkable film and mineral components behavior apparent effect are considered as the equivalent fabric phase and fluid phase.The equivalent fabric phase has both the stress resistance and the shear performance.The equivalent fluid phase only has the stress resistance.It can reduce those relative to the skeleton phase.Complex multiphase of the unsaturated soil is the equivalent fabric phase and fluid phase.So the complex consolidation of unsaturated soil can be solved by two-phase analysis method,which considers the transient compression deformation,the initial equivalent fabric stress and the movement of equivalent fluid phase.This paper sets up one-dimensional equivalent consolidation analysis method.