Abstract: The finite element technique was used to simulate the temperature field and stress held of multilayer diffusion bonding materials TCA/V/Cu/Ni/GCr15 occurring during oil quenching. The effect of martensitic transformation was considered during the simulation. It is shown that stress concentration appears on the adjacent place of interlayer; martensitic transformation in steel layer can alleviate the stress generated in the heat treatment process; the maximal shear stress appears at the edge of Cu layer before the quenching temperature reaching Ms, The reduction in thickness of bearing steel layer can decrease the maximal shear stress in the workpiece, but it cannot eliminate the fundamental source of failure of the workpiece