中文摘要：

利用国家气象信息中心提供的逐日降水和逐日天气现象台站资料，在运用旋转经验正交函数（Rotated Empirical Orthogonal Function，REOF）和相关分析进行降雪分区的基础上，研究了近46a来东北地区降雪的时空分布、演变特征和长期气候趋势。结果表明：东北地区的山地是主要的降雪地区，而平原及平原南部是降雪较少的区域，降雪区域差异明显。在空间上，大兴安岭北部（长白山地区）是降雪增加（减少）最大的地区，小兴安岭地区（平原地区）是降雪增加（减少）较明显的地区。在时间上，东北北区降雪量呈增加趋势，且在20世纪90年代发生了突变，目前增加趋势显著，而东北南区降雪量是减少的。

英文摘要：

Based on daily precipitation and daily weather phenomena data from national meteorological center, snowfall divisions in northeast China during recent 46 years were analyzed by rotated empirical orthogonal function （REOF） and correlation analysis, and spatial-temporal distribution and evolvement characteristics as well as climat- ic trend of snowfall were discussed. The results show that the primary snowfall region is located in mountain areas of northeast China. There is less snowfall in plain and in the south of plain. The regional difference of snowfall is obvious. Snowfall increases （decreases）obviously in the north of Daxing＇anling mountain area（ Changbai mountain area） ,followed in Xiaoxing＇anling mountain area（plain area）. Snowfall shows an increasing trend in the north of northeast China,and there is an abrupt change since 1990s. The increasing trend of annual snowfall is significant until now. However, annual snowfall decreases in the south of northeast China.