This paper provides a statistical study of the variation of the Atmospheric Vorticity Area Index (VAI) during geomagnetic storms for 1966-1978. The results show that the influence of geomagnetic storms on VAIis very obvious. VAIincreases evidently when geomagnetic storms occur, then VAIdecreases, and the maximum decrease occurs on the fourth day after geomagnetic storms. But the variation characteristic of VAIduring each type of geomagnetic stoms is different, and there is obvious season effect in the variation of VAI.