Based on daily precipitation data from 87 meteorological stations in Hetao during 1961 - 2010,and by using methods as linear trend analysis,Mann-Kendall test,composite analysis etc.,temporal-spatial distribution characteristics and the rules of climate changes of the rainstorm days in Hetao are analyzed. Results show that the rainstorm days of Hetao are obviously more in the southeast and less in the northwest,and appear mainly in the southeast. Most of the rainstorm days appear in the single stations,and the rainstorm days of 49. 5% appear in the same day,and the rainstorm days of 74. 1% appeared in July and August. The local rainstorm days are 26. 3 days and the regional rainstorm days are 4. 4 days in every annual,the rainstorm days,local rainstorm days and regional rainstorm days all display reduced tendency in Hetao,and have obvious inter-annual fluctuating variability,but have no abrupt change. The rainstorm often cause casualties,crops disaster,death of livestock,collapse of the housing,roads and communication facilities are damaged,and the economic losses are great.