Abstract: The micromechanical finite element method and the nonlinear spring element for the interface were employed to predict the effective behavior of MMCs.The results indicate that weak interfacial bonding reduces the macro mechanical properties of MMCs.A weak interfacial bonding reduces the elastic modulus of MMCs.The Constant Compliant Interface(CCI) model included a finite interfacial strength for the interface.The stress-strain curve under transverse loading of MMCs has a corner point,associated with the initiation of interfacial de-bonding,which is determined by the interfacial bonding strength.The Evolving Complaint Interface(ECI) model allows unloading of interfacial stresses.The transverse loading stress-strain curve exists three-stage deformation process.