本文采用形状记忆合金（ＳＭＡ）的三维本构方程和有限变形理论，考虑拉、压不同应力状态对相变点移动的规律，编制了ＳＭＡ轴对称大变形的有限元程序，与单向拉伸下解析所得的应力、应变曲线相比，证实程序的正确性．文末计算一ＳＭＡ管接头，并指出按空间轴对称计算的必要性． In this paper, the three-dimensional constitutive equation of shape memory alloy (SMA) and the theory of finite deformation are used to study the regularity of phase transition point under different stress states of tension and compression. Under the analysis of the resulting stress, strain curve compared to confirm the correctness of the program. At the end of this paper, a SMA pipe joint was calculated and the necessity of symmetric calculation by space axis was pointed out.