Abstract: The user material subroutine (UMAT) based on the Lagoudas model was compiled to describe its unique material features of the shape memory alloy (SMA) by using the redevelop technology of the ABAQUS software, and the finite element simulation of thermodynamic property of SMA bump structure was analyzed. The results show that the UMAT can accurately describe the features such as pseudoelasticity and shape memory effect; the bump can undergo large vertical deflection, and most of the area completed the martensitic reverse transformation while only the near of border remained martensite phase.