基于形状记忆合金（ＳＭＡ）材料的Ｂｒｉｎｓｏｎ本构关系，研究了ＳＭＡ驱动器在自由冷却和强制冷却等两种热交换形式下的动力响应问题，探讨了ＳＭＡ丝在恒载及荷载变化时完成正逆相变所需用的时间．研究结果表明，热交换方式对完成相变时间有较大影响，并且增加散热面积和提高热交换速率均可有效地加速相变的完成．最后，本文还简单讨论了影响ＳＭＡ驱动器响应时间的几个因素和改进方法． Based on the Brinson constitutive relation of shape memory alloy (SMA) material, the dynamic response of SMA actuator under two types of heat exchange such as free cooling and forced cooling was studied. The positive and negative Time required for phase change. The results show that the heat exchange mode has a great influence on the completion of the phase transition, and the increase of the heat dissipation area and the increase of the heat exchange rate can effectively accelerate the completion of the phase transition. Finally, this article also briefly discusses several factors that affect SMA driver response time and how to improve it.