The function of void radio e changing with current stress was derived using the theory of Modified Cam-Clay Model. Simultaneously，four groups of classic estimate formula about permeability coefficient changing with void radio were compared to identify the accurate one. User subroutines VOIDRI and USDFLD in ABAQUS were compiled to realize the variation of void radio and permeability coefficient along with the change of current stress of soil. Then the soil displacement，the deformation and the bending moment of retaining structure caused by excavation and dewatering with or without considering the change of void ratio and permeability coefficient with current stress of soil were compared. The results showed that i with changing void ratio,values of ground settlement horizontal displacement of diaphragm wall， bending moment of diaphragm wall and rebound at bottom were larger than those with constant void radio. When permeability coefficient changed with current stress of soil，values of ground settlement，horizontal displacement and bending moment of diaphragm wall were smaller than those with constant permeability coefficient however，the change of void radio and the permeability coefficient with the current stress has no significant impact on soil rebound at bottom.