利用波动方程，研究了超短脉冲艾里(Airy)光束在自由空间传输时的空间诱导群速度色散（SIGVD）效应，并分析了影响SIGVD大小的因素。通过数值模拟，发现二阶SIGVD效应导致脉冲艾里光束在时域展宽，三阶SIGVD效应导致光束在时域出现非对称的拖尾振荡结构，这表明时域也为艾里分布的光束。因此，通过补偿二阶SIGVD效应，利用三阶SIGVD效应，即可在自由空间形成时空域均为艾里分布的Airy-Airy-Airy光束。

The spatially induced group velocity dispersion (SIGVD) of ultrashort pulsed Airy light beam propagating in free space is theoretically studied with wave equations. The factors influencing SIGVD are also analyzed. Moreover, the numerical simulation results confirm that the second-order SIGVD broadens the pulsed Airy beam in temporal domain; and the third-order SIGVD brings the unsymmetrical temporal trailing oscillatory structure of beam, which is just the Airy beam in temporal domain. As a result, it can bring the Airy-Airy-Airy beam in free space, which is Airy distribution both in spatial and in temporal domain, by utilizing the third-order SIGVD on the condition of compensating the second-order SIGVD.