近等原子比NiTi形状记忆合金具有优异的形状记忆效应、超弹性以及良好的耐腐蚀性。NiTi合金制备的多种生物医学植入体已经实现了临床应用。但是,NiTi合金在体液的长期腐蚀下析出的Ni离子,可能对人体造成过敏、发炎和致癌等风险。介绍了近几年来采用氧化、等离子体和涂层方法对NiTi形状记忆合金进行表面改性的研究进展情况,这些表面处理主要是对NiTi合金表面自然形成的氧化层进行改造,形成更加稳定、耐腐蚀性能更高的新表层,以抑制或者隔绝Ni离子的溶出,从而提高合金在长期使用情况下的生物相容性。分别对这几种改性方法的优缺点进行了总结,最后指出了表面改性研究的未来发展方向。 Near-atomic ratio NiTi shape memory alloy has excellent shape memory effect, super elasticity and good corrosion resistance. A variety of biomedical implants made of NiTi alloys have achieved clinical application. However, the NiTi alloy precipitation Ni ions in the long-term corrosion of body fluids may cause the human body allergies, inflammation and carcinogenic risk. The research progress of surface modification of NiTi shape memory alloys by oxidation, plasma and coating methods is introduced in recent years. These surface treatments mainly reformed the oxide layer naturally formed on the surface of NiTi alloy to form a more stable, Corrosion performance of the new surface layer to inhibit or isolate the dissolution of Ni ions, thereby enhancing the long-term use of the alloy biocompatibility. The advantages and disadvantages of these methods are summarized respectively. Finally, the future development of surface modification research is pointed out.