Analysis on the spring sandstorm trend since 1960s in Ningxia was conducted and results show there is an obvious interdecadal change in sandstorms,an abrupt change in spring sandstorm days in Ningxia occurred in the middle 1980s,and the sandstorm days were more frequent before,and obviously less after the middle 1980s.Analyses on long-range changes of circulation,sea surface temperature,gust days,average temperature indicate that the intensity and area of Northern Hemispheric polar vortex,Asia west wind index,SST in Nino3 area and spring gust days,average winter temperature,average temperature difference of winter and spring are correlated with the features of the interdecadal change of sandstorms,i.e.there was a jump in the middle of 1980s of many factors affecting the frequency of cold air activity.The frequency of cold air activity plays a key role in the formation of the trend of spring sandstorm.