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使用丹江口水库流域1970～1998年9～10月降水量、气温及环流特征资料，对该流域1998年9—10月异常干旱与历年同期干旱进行了对比分析。分析结果表明：亚洲地区（45～65°N60～150°E）盛行纬向环流，冷空气势力偏北，西太平洋副热带高压偏强，是导致当年9～10月丹江口水库流域异常干旱的主要原因。
By using the data of precipitation, temperature and circulation from September to October in Danjiangkou reservoir from 1970 to 1998, the author analyzed the abnormal drought in September - October 1998 and the drought in the same period over the same period. The results show that the prevailing zonal circulation prevails in Asia (45-65 ° N60-150 ° E), the cold air force is more northerly and the western Pacific subtropical high is stronger, which is the main cause of abnormal drought in Danjiangkou reservoir basin from September to October of that year .