Abstract: The characteristics and the cause of drought disasters were analyzed by using of historical statistical data of drought disaster in Henan province and reanalysis data of NCEP.The results showed that the frequency of drought disasters in Henan province was high.Regional drought disaster happened almost every year,and large-scaled drought also occurred frequently.The drought disasters also changed obvious decadal.The distribution of annual precipitation had non-uniform and the rainless days occurred more,which was one of the reasons to droughts frequently in Henan province.Weak cold and warm air mass could not meet at basin of the Yellow river and Huaihe river,which was also helpful drought formation.

Key words: Drought disaster, Drought disaster, Change characteristics, Causes analysis