O bjective]T he m ain purpose w as to understand the developm ent trend of sand dust w eather in X ilinguole region, so as to forecaste and prevente sand dust,so as to ensure the developm-ent of agricultural production. [M ethod] T he linear trend test m ethod and the M ann-K endall test techniques w ere applied to detect sandstorm s changes in the last50 years in the X ilinguole region. [R esult]T he analysis results show ed that:the X ilinguole area dust storm s could occurthroughoutthe year,and itoccured m ostfrequently in spring and w inter,but occured the leastin sum m erand autum n. Spring w as the season of the m ost frequent sandstorm w eather phenom ena. T he average num ber of sand dust storm daysin X ilinguole region overthe last50 years had significantly decreased, w ith the m ost significant dow nw ard trend in spring, and the sm allest decline in autum n. T here w ere decadal variation m utation in the season average sandstorm days of X ilinguole L eague in recent 50 years. [C onclusion]O verall, sandstorm s in X ilinguole L eague changed from a relatively high state to low .%[目的]分析锡林郭勒盟地区沙尘天气的发展趋势，从而更好地预报和预防沙尘天气，保障农业生产发展。[方法]采用线性倾向估计和Mann-Kendall突变检验法，分析近50年锡林郭勒盟地区沙尘暴天气变化的特点。[结果]锡林郭勒地区沙尘暴一年四季均可发生，春、冬两季发生最多，夏季次之，秋季最少。春季是沙尘暴天气现象最频发季节；近50年锡林郭勒盟的平均沙尘暴日数都有明显的下降趋势，以春季的下降趋势最显著，秋季下降幅度最小；近50年锡林郭勒盟年季平均沙尘暴日数均存在年代际变化的突变现象。[结论]总体来看，锡林郭勒盟的沙尘暴是从一个相对较多的平均态转变到一个相对较少的平均态。
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